The Mining Magazine, Vol. 75, No. 2

ne iviimng Magazine

V O L . L X X V . No.

L O N D O N , A U G U S T , 1946.

C R U S H I N G P L A N T F O R P R O V I D I N G F E E D F O R

L I M E K I L N S . E Q U I P P E D W I T H 5 S " x 3 6 " B R E A K E R , P A N F E E D E R A N D L I V E R O L L G R I Z Z L E Y .

A L L W E A R I N G P A R T S IN “ E R A ” M A N G A N E S E S T E E L .

5 H f F F / f / 0

H A D F I E L D S L T D . , E A S T H E C L A W O R K S , S H E F F I E L D , E N G L A N D .

No. 3048

s r p R i i ^

The sp eed , low air consumption per foot drilled and ru gged n ess of Cp Drifters com bined with the unique advantage of the <p “ Motorfeed ” forms an unusually strong combination making for outstanding drilling performance. Their operation is e a sy because the steel is run down

automatically while the operator’s time and en ergy are freed . . . fast b ecau se full use can b e m ade of the <p Drifter’s capacity right to the end of the w orking day . . . safe b ecau se the fatigue elem ent is substantially red u ced . Full information will gladly b e p rovided.

A I R C O M P R E S S O R S - P N E U M A T I C T O O L S . E L E C T R I C T O O L S ■ D I E S E L E N G I N E S . V A C U U M P U M P S C O N T R A C T O R S ’ E Q U I P M E N T • R O C K D R I L L S • D I A M O N D D R I L L S ■ O I L W E L L T O O L S

C P26

This Heavy Media Separation process will treat ores o f : IRON, ZINC, SILVER-LEAD, MAGNESITE, FLUORSPAR, TIN, GARNET,

Etc., Etc.

M any m illion tons o f ore, m etallic an d non- m etallic, are a t present being trea ted by this process.

By arran g e m e n t w ith C yan am id P roducts, L td., a P ilot T est U n it is available a t o u r works, the test results from w hich can readily be converted into a full scale p la n t design.

T h e tre a tm e n t o f products from H eavy M edia S ep aratio n can, if necessary, be followed by froth flotation, cyanidation, or by o th er ore dressing m ethods.

O u r w orld wide experience in the tre a tm e n t of ore is a t y our disposal.

M IN IN G MAGAZINE

F R A S E R & C H A L M E R S ENGINE ERING W O R K S

Proprietors : The General Electric Co. Ltd.

ERITH , KEN T.

2— 1 3

HOW M UCH IS CONFIDENCE W O R TH ?

Often, o f course, it is beyond price— the user must place com plete reliance on his materials or not use them at all. So his choice is governed by what he knows or can find out fo r certain about their properties. It is our policy to give thz fu ll facts, good and bad, about the materials which concern us. In terms o f confidence it has proved a m ost profitable policy.

TH E M O N D N IC K E L C O M PA N Y L IM IT E D

G R O S V E N O R H O U S E , P A R K L A N E , L O N D O N , W . I

M S 3c/r

T H E M IN IN G MAGAZINE

"HARCO" ^

P e r f o r a t e d Steel Plates

FO R A N Y S C R E E N I N G OR G R A D IN G R E Q U IR E M E N T

Illustrated, Catalogue, M 450, sent on request.

G A .H A R V E Y A Co.(london)Ltd.

W O O L W IC H ROAD. LONDON. S .E .7

B T R - S i l w t o w n

SERVICE TO INDUSTRY

Mechanical Handling

T h e m o v e m e n t o f r a w materials and goods by Belt Conveyors has revolution­

ised the heavy industries and accelerated progress in the production methods of m a n u f a c t u r e r s a n d distributors.

Immense saving of time and money have been effec­

ted ; materials once con­

sidered to be unworkable have been “ tam ed” ; plants have been literally built a r o u n d t h e i r c o n v e y o r systems. Loads of every conceivable type are being

cheaply and quickly trans­

ported over unbroken miles of belting.

T h e B .T .R /S ilv e rto w n G roup has been closely associated with this great i n d u s t r i a l d e v e l o p m e n t from its inception. Today, its Conveyor Belts are aiding the industrial re­

covery in a thousand and one fields—moving precious grain for our daily bread, carrying coal on and from the coal mines, feeding the production lines in B ritain’s most up-to-date factories.

T H E B . T . R —S I L V E R T O W N G R O U P

* E n g in e e rs in R u b ber *

H E R G A H O U S E , V I N C E N T S Q U A R E , L O N D O N , S . W . l

6

T H E M IN IN G MAGAZINE

i/ W * NIGHT

year in and year out Robey plants are giving reliable service

This is the direct result of the enterprise and initiative exercised by Robey of Lincoln throughout many years experience in the manufacture o f :—

D I E S E L E N G I N E S S T E A M E N G I N E S B O I L E R S

M I N I N G P L A N T

R O A D A N D Q U A R R Y P L A N T A I R C O M P R E S S O R S

F I B R E M A C H I N E R Y C A S T I N G S O F A L L S I Z E S

R O B E Y ^I- CO LTD L I N C O L N Lon d on Office Commonwealth Bonk Chambers

10, Old Je w ry E.C.2.

7

AIR COMPRESSORS

Reciprocating and Turbo types up to 20,000 cubic feet per minute, including special designs for pressures up to 400 atmospheres —

Motor driven air compressors installed at a Copper Mine.

O U T S T A N D I N G R E L I A B I L I T Y - L O W O P E R A T I N G C O S T S - M an y “ B & M ” compressors are running with unimpaired efficiency after 25 years’ service.

BELLISS & MORCOM L

B IR M IN G H A M 16, E N G L A N D

O th e r m a n u fa ctu res

STEAM ENGINES STEAM TURBINES CONDENSING PLANTS

OIL ENGINES ■ "ARCA" REGULATORS ■ PNEUMATIC HOSE COUPLINGS

8

T H E M IN IN G MAGAZINE

18 96 19 4 6

5 0

YEARS OF PROGRESSIVE SERVICE TO THE

ELECTRICAL IN D U ST R Y

T H E B R IT IS H TH O M SO N -H O U STO N COMPANY L IM IT E D . RUGBY. ENGLAND.

P r in c ip a l O v e r s e a s R e p r e s e n t a ti v e s fo r th e B T H C o m p a n y : A U S T R A L I A . Sydney :

Australian G eneral Electric P roprietary Ltd., G .P .O . Box 2517.

M elbourne : A ustralian G en ­ eral Electric Proprietary Ltd..

G .P .O . Box 538-F.

N E W Z E A L A N D . W elling­

ton : National Electrical &

Engineering C o., L td., P .O . Box 1 055.

I N D I A . C alcutta :

Associated Electrical Indus­

tries (India) L td ., P .O . Box 271.

Bombay : Associated Elec­

trical Industries (India) L td., P .O . Box 484.

C H I N A . Shanghai : Inniss &

R iddle (China) Ltd., 43, Yuen Ming Yuen Road.

H ong Kong : Inniss & R iddle (China) Ltd., 1st Floor David House, 67-69, D es Voeux R oad Central.

R H O D E S I A . B ulaw ayo:

Johnson & Fletcher Ltd., P .O . Box 224.

S O U T H A F R I C A . Johannesburg : W ilson & H erd Ltd.. P .O . Box 7733.

Capetow n : Wilson & H erd, Engineering (P ty .), Ltd. P .O . Box 1459.

W E S T A F R I C A .

Sekondi, Gold Coast Colony : T h e W est African Electrical Co., P .O . Box 8.

K E N Y A , U G A N D A . T A N ­ G A N Y IK A .

Nairobi : R . G. V ernon & Co., P .O . Box 124.

N a iro b i: British East Africa Corporation (1939) L td., P .O . Box 182.

D ar-es-Salaam : Lehm ann’s (Africa) Ltd. (for lamps only), P .O . Box 163.

a n d o th e r s th r o u g h o u t th e w o r ld .

T H E M IN IN G MAGAZINE

M E T R O V IC K

Flame^U^prooF

TH R U ST O R S

W h e r e v e r a straight thrust motion is required the thrustor is being used for ever increasing applications. It is sup­

plied for 2 o r 3 phase 50 cycle working at 650 volts, the three types of thrustor, giving from a thrust of 150 lb. with a 3 in.

stroke up to 800 lbs. with a 12 in. stroke.

Send for descrip tive lea flet 12/4-1.

l C K e r s

A P P L I C A T I O N S include operation of:

BRA K ES LATCHES GATES HOISTS SLID IN G DOORS CONTROL V A LV ES o r w h e r e v e r a b r a k e m a g n e t o r a l e v e r m e c h a n i s m i s u s e d .

The photograph Thom two flameproof thrustor? on a haulage winder In the ' foreground the thrustor operates m y auxiliary brake through ,

a P ic h rtn g governor on to the 'high s p e e d t h e f t

J / J 601

l i

• vP Ha Hi

%

< &

; M i y No r w a y PORTUGAL ROMANIA

SPAIN sVJto tN

PtRVJ

FIJI ISLANDS PHILIPPINE ISLAI

C Ï Ï MST «»

. ? % > " "

Ai

* % **4 u

£> TDu ^ ^-a. M y

\ v

* °

V '■¿f, Kr. &

A G R E I

/ 6

NATIONS

that the Sym ons Cone is w ith o u t equal for fine crushing operations. This is evidenced b y its use in p ractically e v e ry industry in e v e ry country throughout the w o rld w h ere ores, rock, g ra ve l, slag and sim ilar m aterials a re produced in q uantity. Users am ongst all nations a g ree that the Cone d elivers a f in e r p ro d u c t in g r e a t e r c a p a c ity a t lo w e r cost th a n w a s e v e r possible w ith a n y type of reduction crushing equipm ent.

NORDBERG MFG. CO.

B ro o k H o u se , P ark L a n e , L o n d o n , W .l

T e le p h o n e : M a y fa ir 3067/8 T e le g ra m s : N o r d b e r g , A u d le y , London

Head Office and W orks : M IL W A U K E E , W IS C O N S IN , U.S.A.

S Y M O N S CONE C R U S H E R S

12

UNIFORMITY

The constant uniform ity of Bear Brand Xanthates is one of the outstanding characteristics of these widely accepted flotation reagents.

U sers know that any single drum or carload of drum s can be depended upon to show the same quality as previous or subsequent shipments.

T H E M IN IN G MAGAZINE

Z3— Potassium Ethyl X anthate Z4— Sodium Ethyl X anthate Z5 *— Potassium Amyl X anthate Z6 *— Potassium Pentasol Am yl X anthate Z8— Potassium Secon d ary Butyl X anthate Z9— Potassium Isopropyl X anthate Z10— Potassium H exyl X anthate

pioneer producers of Xanthates for metallurgical use

C H E M I C A L S I N D I S P E N S A B L E T O I N D U S T R Y

*Frozn S h a r p ie s A m y l A l c o h o l

G R E A T W E S T E R N D I V I S I O N

T H E D O W C H E M I C A L C O M P A N Y

S A N F R A N C I S C O C A L I F O R N I A , U . S . A .

13

THERMAL LINKAGE

1 SAVES FUEL 2 CUTS

PRODUCTION COSTS

3 INCREASES OUTPUT

f i J o t a t h e o r y — a t r i e d m e t h o d a l r e a d y o p e r a t i n g i n , m a n y p r o g r e s s i v e p l a n t s

What is “ Thermal Linkage ” ?

How does it achieve such noteworthy results ? Briefly, it is a practical method of integrating your heat-using processes, aiming towards operating them as a single co-ordinated heat-using plant. With Thermal Linkage, total heat will no longer be independently supplied to the several separate points of consumption.

Instead, heat is systematically circulated from point to point, achieving maximum work, minimum waste.

Thermal Linkage saves brewer 46% of his coal

METHOD USED: D i r e c t - f i r e d copper converted to steam- heating. Heat exchanger in­

stalled to utilise vapour from copper. Para-flow cooler in­

corporated, allowing cooling water to be heated direct to 135°F. Steam coil in liquor tank trapped and all condensate re­

turned to hot well. Steam leakages stopped. Exhaust from boiler feed pump passed through coil in the hot well. At hot-well temperature of 185°F. all con­

densate diverted into hot-water storage tank by thermo-regu­

lator.

R a f / I K O a sma^ brewery used 13 tons o f coal weekly D e i o r e to produce 70 barrels per day.

F O R C O M P L E T E D E T A IL S S E E

" F U E L E F F IC IE N C Y N E W S ,”

J A N U A R Y , 1946.

" ' ' ' C THERMAL CONSIDER

~ LINKAGE

"/ / i i 1 1 M ' N O W The need for fuel efficiency is pressing and will remain so. If the principles of Thermal Linkage are not being applied to your plant, go into the matter ^now.

F O R G E N E R A L I N F O R M A T I O N

see Fuel Efficiency Bulletin No. 21 (The Construction of a Factory Heat Balance).

f o r s p e c i f i c a d v i c e and guidance contact your Regional Office of the Ministry of Fuel and Power.

w tp

eO TTlI CASK

HASHING WASHING

± ___________±

A f f c r the same brewery for the same output, consumed M l 1 C I only 7 tons per week.

I S S U E D B Y T H E M I N I S T R Y O F F U E L A N D P O W E R

14

T H E M IN IN G MAGAZINE

P ro d u c e r o f th e W o r l d ’s W id e s t L in e o f M a jo r In d u s tria l E q u ip m e n t . . . o v e r 1,600 D iffe re n t P ro d u c ts th a t F u r th e r G o o d L ivin g !

Seven A llis -C h a lm e r s 10% by I / foot Ball M ills w ith herringbone gear drives in sta lled in processing p la n t. A llis -C h a lm e r s builds ball m ills in d ia m eters fro m 3 to 10% feet ; len g th s fr o m % to 2 tim e s d iam eter. A v a il­

able in d ia p h ra g m , overflow, perip h era l discharge, batch a n d special open-end types. For a n unb ia ssed recom m endation to su it yo u r g rin d in g needs call on A llis - C h a lm ers— builders o f the w o rld 's largest line o f g rin d in g m i l l !

ALLIS-C H A LM ER S M A N U F A C T U R IN G C O M P A N Y offer products of quality and integrity as the builders of the w o rld ’s widest range of major industrial equipment.

For Allis-Chalmers builds complete power generation, distribution and control equip­

ment— pumps— motors— V-belt drives— crushing, cement and mining equipment—

flour— milling, food and chemical processing equipment— in all, over 1,600 different products that aid industry and further good living ! Your enquiries for information or literature will receive prompt attention from—

ALLIS-CHALMERS

MANUFACTURING COMPANY,

T O T T O N , S O U T H A M P T O N

T elep h o n e: T O T T O N 3161/2.

15

The

GUARDIAN OF THE P IT S

\

\ Efficient braking is an im portant con ­ tribution to the safety o f the pits and w here the F E R O D O L ion keeps guard th e safety o f W in d in g Gear is assured.

F E R O D O Friction Materials g iv e longer periods o f unfailing service because th ey are the ou tcom e o f ceaseless e x ­ perim ent and research in the F E R O D O T est H ou se w here the m ost drastic efficiency and endurance tests are con- [ stantly carried out to ensure that

F E R O D O Brakes are the best o f then- k in d . Ensure safety and e c o n o m y :

a lw a ys specify

FERODO

FRICTION LININGS

j

• C H A P E L - E N 16

- L E - F R I T H RECft T«ADt HARK|fib q p .o |

T H E M IN IN G MAGAZINE

Use an

E D G A R A L L M

S T A G

B A T E MILL

FOR GRINDING DOWN ORES AND OTHER MATERIALS TO SPECIFIED FINENESSES

Special Features:

# Continuous feed and discharge.

# Simple , solid construction.

• Low upkeep.

• Accessibility o f parts.

W rite for pamphlet to :

E D G A R A L L E N & C O M P A N Y , L™

I M P E R I A L S T E E L W O R K S ! - S H E F F I E L D

-9

★ Also Tube Mills, Crushers, Granulators, etc.

17

Products include:

D IE S E L E N G IN E S S T E A M T U R B IN E S

S T E A M E N G IN E S

•

H E L I C A L G E A R IN G C O N D E N S IN G P L A N T

• D E -A E R A T O R S C E N T R IF U G A L P U M P S

•

T U R B I N E P U M P S A X I A L F L O W PU M P S

D .C. G E N E R A T O R S

• D .C . M O T O R S C O N T R O L G E A R S W IT C H B O A R D S

W . H. A L L E N — the name that is backed by over 65 years’ specialised experience in mechanical, hydraulic and electrical machinery, conforming to the latest scientific and technical developments and maintaining a world-wide reputation for quality and reliability.

W e specialise in the design and construction of complete power generating plant and pumping machinery installations for industry and public services.

T H E M IN IN G MAGAZINE

DUNLOP

D U N L O P Face belts delivering to Gate belt at the Manchester Colliery Company's Workings

D U N L O P R U B B E R C O . LTD., G E N E R A L R U B B E R G O O D S DIV ISIO N , C A M B R ID G E STREET, M A N C H ESTER Lo nd o n : C lerkenw ell House, C lerkenw ell G reen E .C .I. Birm ingham : Dunlop House, Livery Street, 3.

Liverp o o l: 24 C ornhill, Park Lane, I. Glasgow : 48-60 and 70-78, N o rth W allace St., C .4.

2—2 19

46/GRG/27A

Made in sizes to handle from 50 to 5,000 gallons a minute.

Simpler and

Faster

They are the only pumps in the world which pump and reprime without re­

circulation. As a consequence, they are simpler and much faster. Only two moving p a rts; little to wear, nothing to go wrong. They handle dirtier water— up to 2 5 % content of solids. They are reliable non-stop workers, giving you efficient, trouble-

20

free service, year in, year out. May we send you details ? Ask any ques­

tions you like. They will be answered carefully.

P E G S O N Ltd., Dept. P. 31 Iddesleigh House, Caxton Street,

Westm inster, London, S.W . I

P h o n e : A b b e y 2373.

W o r k s : C o a lv ille , L e ic e s te r .

1 H E M IN IN G MAGAZINE

THE KENT RS/C METER

Being of the shunt type, the Kent RS/C steam meter is simple in itself, and simple to instal. It can be put in the run of the main, or in a shunt by­

pass across an orifice in a large main. A particular feature is its suitability for checking steam con­

sumption of individual departments or machines.

Slow pulsations amounting to as much as 9 0 % of the range do not affect the accuracy of integra­

tion. The meter is suitable also for air.

GEORGE KENT

G a t e t y p e a ir flo w in d ic a t o r .

--- N

C u r v e d t u b e m a n o m e t e r fo r a i r o r gas flo w s .

A i r o r gas f lo w r e c o r d e r R in g - b a la n c e t y p e .

G E O R G E K E N T L T D ., L U T O N A N D L O N D O N

2 ^b W h a t is a Diamond Core D rill—

Briefly it is a machine which rotates a line of hollow steel rods having attached a core barrel and bit. As these rotate they are fed or advanced into the rock as drilling proceeds. W a te r is pumped through the rods to the bottom of the

hole to keep the bit from “ burning ” and to wash up sludge or cuttings which are part of the sample. A t intervals rods are pulled and cores extracted from the core barrel. Cores and sludge give a perfect record of what actually

lies at depth.

U s e th e L O N G Y E A R J u n io r S t r a it lin e fo r D e e p e r C o re D rillin g

This model with a capacity of 900 ft. of |-in.

core is in demand for general exploratory purposes. Drilling from surface or underground it reveals the location and size of your ore body.

Core and sludge samples produced and analysed disclose the quality and grade of ore.

The Junior Straitline may be equipped with petrol, air, electric or Diesel motive power. The swivel drilling head may be either screw feed or hydraulic type. Bit speeds up to 2,100 r.p.m.

are obtainable. There is a 4-speed transmission and a drum hoist. W rite for particulars.

CANADIAN LONGYEAR, LIMITED, Norlh Bay, Ontario, Canada

LONDON REPRESENTATIVE

A U S T IN H O Y A N D C O M P A N Y , L I M I T E D , 39, S t . James Place, S.W . I O th e r representatives in O slo , N orw ay ; H elsin k i, Finland ; Johannesburg, S . A . ; Perth ,

W estern A u s t r a lia ; W ellington, N ew Zealand.

22

T H E M IN IN G MAGAZINE

MORSE DEPENDABLE CONCENTRATING EQUIPMENT COMPRISES

HEAD, WRIGHTSON tC9LT?

S T O C K T O N F O R G E , S T O C K T O N - O N - T E E S

iö"w 23

M orse-“ W e in ig ” F lo ta tio n C ells F lo ta tio n R eage nt Feeders V acu u m D ru m F ilte rs V a cu u m D isc F ilte rs F ilt e r V a cu u m E q u ip m e n t R ake and A i r L ift A g ita to rs P r o p e lle r and A i r L ift A g ita to rs P r o p e lle r T y p e C o n d itio n e rs S ta n d a rd R a k e T h ick e n e rs Im p ro v e d R a k e T h icken ers V a ri- S tro k e O r e Feeders Pu lp and O r e S a m p le rs P re c ip ita tio n E q u ip m e n t Im p ro v e d M in e ra l Jig s C o n c e n tra tin g T ables M uffle and M e ltin g Furnaces L a b o ra to ry E q u ip m e n t

W e also manufacture grinding, classifying, drying, roasting and ore handling plant.

Morse Conditioner

Morse-" Weinig” Flotation Machine Morse Drum Filter Morse Thickener

T H E M IN IN G MAGAZINE

1' e c a l e m i 'T'

A U T O M A T I C M E C H A N I C A L L U B R I C A T I O N

H y d ra u lic & M echanical, D esigning & M a n u fa c tu rin g E ngineers

G REAT W E ST R O A D , BRENTFORD, MIDDX.

Phon e: EALing 6661 (16 lines)

T. 131.

c P f r a c / iv f z r i y io / t

i n

1044 1JU

h r o u g h o u t ilie a g e s every b r a n c h o j a r t, scien ce a n d i n d u s t r y h a s p r o d u c e d its m a s te r p ie c e s .

T o d a y th e ' T ’e c a l e m i t r e n t f o r d ” Q fYlecha m e a l (zPutnfy — o n e o j a series d e s i g n e d to m e e t a l l th e lu b r i c a t i n g r e d u i r e m e n ts o j i n d u s t r y— c a n j u s t i f i a b l y be d e s i g n a te d a m a s te r p ie c e o j e n g i ­ n e e r in g i n g e n u i ty a n d c r a f ts m a n s h i p .

26

T H E M IN IN G MAGAZINE

For Haulage in

MINES ^{a n d} QUARRIES

All round operation is the keynote of the Ruston Oil Engined Loco. Under the most arduous conditions the Ruston machine has proved its ability to give satisfaction, whether it be on the surface or for underground use, for narrow or standard gauges.

The Loco is made entirely by Ruston— there being no divided responsibility.

Ask Ior descriptive catalogue

R U S T O N

O IL EN CIN ED LOCOS

R U S T O N & H O R N S B Y L T D. . L I N C O L N

A s s o c ia t e d w ith D A V E Y P A X M A N & C O . . L T D . . C O L C H E S T E R

27

t h e W I L F L E Y

MINING MACHINERY C O .r LTD.

Specialize in the design and construction of self-contained gravity concentration

plants for use on small mines, as pilot plants to try out bulk samples, for making test runs to check results before installing large-scale equipment, or for treating tailings, residues, secondary ores, and the like.

These plants embody the most suitable types of crushing, grinding, screening, concentrating, and handling appliances and are designed to economize in capital, installation and operating costs.

WILFLEY CONCENTRATING TABLES WILFLEY SAND PUMPS COPPUS FANS AND BLOWERS

MACE SMELTERS MACE SINTERERS

^ c o m m u n i c a t i o n s t o :

S A L IS B U R Y H O U S E , L O N D O N , E.C.2

T e le p h o n e : M a n s i o n H o u s e 1 6 7 4 T e le g r a m s : W r a t h I e s s , L o n d o n

IT BEARS THE HALL-MARK OF HIGH-CLASS MATERIALS AND GOOD WORKMANSHIP.

NATIONAL GAS AND OIL ENGINE CO.LTD.

A S H T O N - U N D E R - L Y N E L A N C A S H I R E

" M y A b.h.p. N ation al gas engine N o . 1241 has been in regular use since 1891. It is d rivin g m y farm m ach in ery — g ris t m ill, chaff c u tter, etc. Repairs have been negligible and I re adily express m y g re a t satisfaction w ith it's long and efficient servic e .”

E x t r a c t o f le tte r fro m M r. H . C . H a ld a n e , C la rk e H a ll, W a k e fie ld .

T H E M IN IN G MAGAZINE

29

NOISE

A n d re direct-bo nd ed , solid rub ber ty re s fo r W o r k s T ru c k s embody the m ethod of tyrin g proved in T a n k Bogie W h e e ls.

P ro m pt d eliveries of new w heels and ty re s fo r L I S T E R T ru c k s o r custom ers' ow n w heels retyred .

F o r fu ll d eta ils o f A n d re R u b b er bonded- to-m eral, please req uest o u r com p re h e n ­ s ive tre a tis e ■* E la s to m e ric E n g in e e rin g ,’*

gladly supplied to responsible executives.

t í H O M R U B B

KINGSTON-BY-PASS, SURBITON, SURREY

TELEPHONE ELMBHIOCE iSIO/J fa U S U B ftU B B

T A S/A R 37

Send your enquiries to IOI T H E B I R T L E Y C O M P A N Y L T D . , B I R T L E Y , C O . D U R H A M

d u r i n g t h e w a r y e a r s , a n d t h e s e v e r a l n e w I n s t r u m e n t s s c h e d u le d

r i j *ii T h e 5 0 - r a n g e M o d e l 7 U n iv e r s a l A v o M e t e r is the

l o r e a r l y p r o d u c t i o n w ill m e a s u r e u p . r „ . .. ,

' r r VJPy ' ^ g g y jC p i le a d e r o f th e w o r ld - f a m e d r a n g e o f A v o E le c t r i c a l

to t h e t r a d i t i o n a l “ A v o ” s t a n d a r d s M e a s u r i n g In s t r u m e n t s w h ic h a r e a p p r e c ia t e d fo r th e ir c o m p a c t p o r t a b ilit y , d e p e n d a b ilit y , a n d a

o f a c c u r a c y a n d r e l i a b i l i t y . st e a d f a s t a c c u r a c y w h ic h is o fte n u s e d a s a s t a n d a r d b y w h ic h o t h e r in s t r u m e n t s a r e ju d g e d . F u lly d e s c r ip t iv e p a m p h le t a v a il a b le o n a p p lic a t io n . S o le P r o p r ie t o r s a n d M a n u f a c t u r e r s :—

A u to m a tic Coil W in d e r & E lectrical E q u ip m en t Co. L td., W i n d e r H o u s e , D o u g la s S t ., L o n d o n , S . W . I ’P h o n e : V ic t o r ia 3 4 0 4 - 8

G e t t i n g

O f c o u r s e y o u d o n ’t h a v e to t a k e u s to o l i t e r a l l y , b u t w e a s s u r e o u r i n n u m e r a b l e f r i e n d s t h a t w e a r e

p r e s s in g o n w i t h t h e p r o d u c t i o n o f a ll t h e w e l l - k n o w n u A y o ” T e s tin g I n s t r u m e n t s w i t h a v ie w to s p e e d in g u p d e liv e ry d a t e s a s t i m e g o e s o n .

M e a n w h ile w e h a v e n o t n e g le c te d to u s e t h e a d v a n c e s p e r f e c te d

D o w n

F O R W E L D I N G S A N D F A B R I C A T I O N S

He may be able to interest you in our other activities — SHEET METAL A N D PLATE WORK, PRECISION MACHINING, PLASTICS MOULDS A ND MACHINERY MANUFACTURE, ALSO COMPLETE COAL PREPARA­

TION A N D MATERIALS HANDLING PLANTS. In the near future STOVE A N D VITREOUS ENAMELLING

30

T H E M IN IN G MAGAZINE

1

M a d e a t P ire lli- G e n e ra l C a b le W o r k s . S o u th a m p to n This new range of cables has been specially designed to meet the need for a welding cable that is extrem ely flexible and easy to handle and yet will stand up to the heavy service demanded. One more example of how the Com pany’s research and produc­

tive resources in the cable field are always alert, ready to improve and develop.

vc*TI°/v

A d v t . o f T h e G e n e r a l E le c t r ic C o ., L t d ., M a g n e t H o u s e , K in g s w a y , L o n d o n , W . C . 2 Nos 566585 6V

31

HIGH EFFICIEN CY INDUSTRIAL PLANT

WESTGARTH B R O WN B O V E R I . LTD.

H A R T L E P O O L

„ o n e r

I D A V I E S M A G M E T W O R K S 17.“

W A R E , H E R T F O R D S H I R E . T e le p h o n e : W a r e 48?.

32 M.M. II tg*

T H E M IN IN G MAGAZINE

**

D rillin g D epth 600 ft.

Cores 1 J in. to f in. Automatic pressure controlled screw feed.

W eig ht with engine and flush pump 1,150 lb. Drive air, electric, or petrol.

C R A E L IU S CO M PA N Y, Ltd.

12, C LA R G ES STREET, LO N D O N , W . I

T E L E P H O N E : G R O S V E N O R 1378 9 T E L E G R A M S : C R A E L IU S , LO N D O N

A g e n ts f o r

T H E S W E D IS H D IA M O N D R O C K D R IL L IN G C O M P A N Y

Craelius

PROSPECTOR'S CORE DRILL

33

Ropes for shipping ; ropes for mining ; ropes for engineering ; ropes for agriculture ; ropes for fishing ; ropes for excavating ; ropes for transport. Ropes for every conceivable purpose from mighty hawser to humble clothes line, including the fittings and tools for their most efficient use.

This abridged list gives some idea of the scope of the activities of British Ropes Limited. In addi­

tion, we make twines and cords, canvas and tarpaulins and wire of all descriptions. It is safe to say that whatever your business, British Ropes Limited can serve you.

B R I T I S H R O P E S L I MI T E D

M A N U F A C T U R E R S O F W IR E RO PE, W IR E , H EM P C O R D A G E & C A N V A S

Head Office :

D O N C A S T E R E N G L A N D

b.r . i

1887 ^{■ I I}

THE CYANIDE PROCESS WAS FIRST USED

FOR GOLD EXTRACTION

and, after nearly 60 years, like

" Cassel B r a n d " High Grade Sodium C y a n i d e it is still unsur­

passed as the means of recovering gold from refractory ores.

“ CASSEL” BRAND

CYANIDE

I M P E R I A L C H E M I C A L I N D U S T R I E S L I M I T E D

L O N D O N , S .W .l

M GX X7

34

T H E M IN IN G MAGAZINE

P

5

SAMPLER

The sampler is designed to collect a truly representative sample from a stream of liquid or pulp and can handle par­

ticles varying in size from 1£ in. downwards in either wet or dry conditions.

The table below shows the weight of sample (in lb. per hour) collected per ton/hour for various cutter widths and time intervals.

By means of this table the weight of sample in lb. gathered per hour can be calculated. To do this : Multiply the figures in the table by the tons per hour known to be passing in the main stream of liquid or pulp.

Time Interval

Minutes t

C U T T E R W ID T H S

i i i

IN IN C H E S (Usually 3 times particle

i 1 I ł H 2

size)

2 i 3

5 0 078 0-156 0 234. 0-311 0-467 0-622 0-778 0 934 1 - 25 1-56 1-87

10 0 039 0-078 0-117 0-155 0-233 0-311 0-389 0-467 0-625 0-780 0-935

15 0 026 0-052 0-078 0-104 0-156 0-208 0-260 0-312 0-416 0-520 0-624

20 0 0 1 9 0-039 0-058 0-077 0-116 0-155 0-194 0-233 0-312 0-390 0-467

30 00 1 3 0-026 0-039 0-052 0-078 0-104 0-130 0-156 0-208 0-260 0-312

R. O. STOKES & CO. LTD.

Mechanical and Metallurgical Engineers

538/540, S A L IS B U R Y H O U SE, LO N D O N , E.C.2

Telephone : M AN sion House 1161. Telegram s : Rostoke, Phone, London.

________________ ________ Cables : Rostoke, London.

R O D U C T S O F

K. O. ST O K E S A Co., Ltd.

AUTOMATIC PULP

35

HUDSON CA ST S T E E L W H EELS

M A D E I N

O U R OW N STEEL F O U N D R Y

A lso M akers o f

COMPLETE WHEELS AND AXLES

Q u ick D eliveries

ROBERT HUDSON LTD- LEEDS

L O N D O N O F F I C E : 21, T othill Street, S.W . I. ’P ho n e: W hitehall 7127.

300/460 H.P. D O U B L E D R U M E L E C T R IC W I N D E R

U S K S I D E E N G I N E E R I N G C o . L T D . N E W P O R T , M O N ., E N G L A N D

T E L E P H O N E : N E W P O R T 3921 T E L E G R A M S : U S K S I D E , N E W P O R T

WINDERS OF ALL SIZES

W IT H D R U M S U P T O 14' 0" D IA M E T ER

36

TH E MINING MAGAZINE

Photo by courtesy o f 1.0 .1 . (Explosives) Ltd.

The advance of m icro-chem ical technique has been facilitated by th e reliability and handiness o f O e r t l i n g m ic r o a n d s e m i= m ic r o b a l a n c e s .

For example : The N o. 63 P /P B

m ic r o - c h e m ic a l b a la n c e gives direct readings in thousanths o f a milligram up to 0-1 mg, plus or minus, w ithout the use o f riders or fractional weights.

L . O E R T L IN G , L T D .

n o , G L O U C E S T E R P L A C E , L O N D O N , W. i.

(Near Baker Street Station.) ’ Phone : W E L b eck 2273

37

YUBA EXPERIENCE WILL HELP TO SOLVE YOUR DREDGING PROBLEMS

If your plans include the dredging of alluvial deposits Y U B A can help you to prepare for the future. W h e th e r your problems are deep digging or shallow deposits, clay, boulders or sandy ground, a new dredge or a redesigned dredge, Y U B A experience can help you solve your particular problem.

Y U B A has specialised in the manufacture and field construction of alluvial mining dredges for almost 40 years and has unequalled experience gained from daily association with dredge operators.

Y U B A therefore offers the operator a unique service— the ability to solve his unusual dredging problems.

vubr mnnuFRciuRinG co.

351 C a lif o rn ia St., San Fran cisco , C a lifo rn ia A G E N T S :

R l l U U I R L D R E D G E S L T D.

C A B L E S - Y u b .

T e m p o r a r y A d d r e s s :— R e n f r e w , S c o t la n d .

W O R T H I N G T O N - S I M P S O N , LTD N E W A R K - O N - T R E N T

WORT HIN GTON - SIMPSON

T y p e •' A T ” T w o S ta g e A i r C o o le d .

O T H E R P R O D U C T S

High Lift Centrifugal Pumps, Vacuum Pumps, Boiler Feed Pumps, Surface Condensing

Plants, etc., etc. T y p e “ D A ” T w o -

Sta g e W a t e r C o o le d .

S e n d y o u r E n q u i r i e s to

38

T H E MINING MAGAZINE

THE BEAUMONT DRAG SCRAPER

The Beaumont Drag Scraper with its finger-tip control enables one unskilled man to stock and reclaim thousands of tons of coal.

The Technical Staff of International Combustion Ltd. are always ready to

■ bring their exceptional experience to any Material Handling problem.

INTERNATIONAL g ) COMBUSTION LT.D

N I N E T E E N W O B U R N P L A C E , L O N D O N , W . C . I

H.2

DREDGER GEAR

P O I N T S T O R E M E M B E R : —

' " E r a M a n g a n e s e Steel of which we a r e t h e o r i g in a l inventors is unsur­

passed for long life and resistance to wear.

T^TWe h a v e h a d 50 years experience in the application of Era Manganese Steel to dredging problems.

^ T W e are equipped both in plant and technical experience to deal with the largest and heaviest c o m p o n e n t s f o r modern dredges.

• k O u r range covers Gearing, Buckets, Tumblers, Rollers, G rubbers, and in fact all moving parts subjected to heavy wear.

★ W e are ready to deal with your problems N O W .

P A T E N T HEADLESS D R E D G E R B U C K E T

P I N L O C K I N G

D E V I C E

( o f w h i c h H a d f i e l d s a r e t h e s o l e m a k e r s )

Pin held at three points A. B. C ., which prevents any possibility of the pin “ rocking ” in the eye of the bucket.

The device is fitted to both ends of the pin.

H A D F I E L D S

______

y

H A D F I E L D S L t d . ,

4 0 No. 30 78

The Mining Magazine

Pu b l i s h e d o n t h e 1 5 t h o f e a c h m o n t h a t Sa l i s b u r y Ho u s e, Lo n d o n, E . C . 2 , f o r M i n i n g Pu b l i c a t i o n s, Lt d.

E d i t o r : F . Hi g h a m, A . R . S . M . , M . S c . , A s s o c . I n s t . M . M .

M a n a g e r : S t . J . R . C . S h e p h e r d , A . R . S . M . , D . I . C . , F . G . S . C h a i r m a n : H . E . F e r n , O . B . E . , J . P . T e le p h o n e : M O N a r c h 9 4 1 6 . T e le g r a p h ic A d d re ss : Oligoclase. C o d e s : M c N e ill, b o th E d it io n s , & B e n tle y.

Br a n c h Of f i c e, N e w Y o r k : A m e r . In s t. M . & M .E . Su b s c r i p t i o n { l ^ p T a n n i m ’ ^ n d u d in f p o s t a g e .

Vol. L X X V . No. 2. L O N D O N , A U G U S T , 1 9 4 6 ./ ^ C Í 0 7 ^ epsh ? lling

C O N T E N T S

P A G E P A G E

M elbourne ... 108

E d i t o r i a l

Notes ... 70

New Zealand M ining ; Coal Compensation ; Progress in M alaya ; Silve r Price Increased ; B ritish P ro perty in E uropean Countries.

U nited Kingdom Mineral R esources. . 70

The constitution and term s of reference of the new M ineral D evelopm ent Com m ittee are exam ined.

B ritish Mining In terests Overseas . . . . 71

Attention is called to the inauguration of the B ritish Overseas M ining Association.

Nigeria in 1944... 72

T he report of the Mines D ep artm ent is reviewed.

Mo n t h l y Re v i e w ... 73 Di v i d e n d s De c l a r e d ... 76 Ar t i c l e s

V enezuela: The Venezuelan Andes and the Coastal and Interior Ranges

Jo h n C. Davey 77

A seventh article on the resources of this South Am erican country.

An Escape Tunnel in G erm any

D. J . Rogers 87

An account of a project th at failed.

O r e - D r e s s i n g N o t e s ...

98

R o astin g Flotation C oncentrates ; M achine Records ; Flo tatio n Cell D esign ; Progress Rep ort.

En g i n e e r i n g Lo g ... 1 0 0 Ne w s Le t t e r s

V an co u v er... 103

Mine Lab o u r ; A tlin ; Portland Canal ; Sk een a ; A lb e r n i; V ictoria ; Nanaim o ; Lillooet ; C ajl^oo ; Omineca ; Osoyoos ; Greenwood ; Nelson ; 9* San ; Y u k on Territo ry.

Toronto ... ;.06

Gold Production ; Porcupine ; K irk land L ak e ; M ata- chew an-Sudbury ; N orth-W estern Ontario ; M ani­

toba ; Quebec.

2— 5 69

Gold in W estern A u stralia ; Gold in V ictoria ; Aberfoyle • T in Mine ; A 1 Gold Mine ; D evelopm ent Possibilities a t Kalgoorlie.

Pe r s o n a l... I l l Tr a d e Pa r a g r a p h s... 1 1 2 R ansom es an d R a p ie r E x c a v a t o r s ... 112 H o p k in so n 's Soot B lo w e r s ... 113 B risto l A ircraft ... 114 M e t a l M a r k e t s ... 115 S t a t i s t i c s o f P r o d u c t i o n ... 117 P r i c e s o f C h e m i c a l s ... 119 Sh a r e Qu o t a t i o n s ... 1 2 0 Mi n i n g Di g e s t

A ids for th e M odern P ro sp ecto r

R . B . Gayer 121 U p -G rad in g a Zinc C oncentrate

D. A . Livingstone 124 T h e Clim ax M olybdenum E n te rp rise

W . J . Coulter, F. S. M cN icholas, and A . D.

Storke ... 126 R e p o rt on a Californian Copper D eposit

R . H. Bedford 130 E le c tro sta tic T ests on Q ueensland Beach-

Sand C oncentrates

/ . G. H art and H . H . D u n k in 131 O re R eserves in th e U n ited S tates

G. M . Fowler 133 E x p lo rin g C anadian A sbestos

G. K . Foster and C. D. Borror 134

R e c e n t P a t e n t s P u b l i s h e d ... 13 4 N e w B o o k s , P a m p h l e t s , e t c ... 13 4 Se l e c t e d In d e x

t o C u r r e n t L i t e r a t u r e 135

T H E New Zealand G overnm ent announces its in ten tio n to enlarge th e Otago School of Mines and to augm ent its equip­

m ent, p articu la rly in connexion w ith plans for th e developm ent of its policy of tak in g over “ w orth-w hile ” coal mines.

I T was recently announced th a t th e trib u n al appointed to determ ine th e “ global s u m ” of com pensation to be paid for the assets of th e coal in d u stry to be transferred to th e N ational Coal B oard under th e Coal In d u stry N ationalization Act of 1946 had issued its aw ard. The am ount involved is set a t £164,660,000.

S P E A K IN G a t th e recent annual general m eeting of th e M alayan Cham ber of Mines held in London th e chairm an, Mr. A. G.

G lenister, said applications for financial aid tow ards rehabilitation were now being received from operating companies and th a t th e y were being exam ined by th e Govern­

m ent. T he Cham ber h ad been able to minim ize delays in obtaining supplies, b u t while requests h ad been dealt w ith as quickly as possible delay in sta rtin g up m an y of th e

“ A ” class dredges was inevitable. A few dredges h ad been s ta rte d up and certain hydraulic m ines h ad commenced production on a sm all scale.

E A R L IE R this m o n th th e London official selling price for silver was raised from 44d. per oz. to 5 5 |d . I t will be recalled th a t th e qu o tatio n was advanced to 44d. from its w ar-tim e level of 2 5 |d . on Septem ber 24 last. The new change is directly a ttrib u ta b le to th e recent increase from 71-11 cents to 90J cents per oz. in th e U nited S tates T re asu ry ’s buying price for newly-m ined dom estic silver, which had th e effect of raising th e price of foreign silver in American m ark ets to 90f cents per oz. The advance in price is th o u g h t likely favourably to influence silver m ining operations in various p a rts of th e world.

C LAIMS by B ritish owners for th e restoration of th e control of pro­

perties in Y ugoslavia are to be dealt w ith b y a Mixed Commission which has been set up in Belgrade. In order to facilitate th e w ork of th e U nited K ingdom representa-

tive in presenting and pursuing claim s for such resto ratio n a register of B ritish p ro p erty in Y ugoslavia is now being e sta b ­ lished. I t is to be k ep t in th e T rading w ith th e E nem y D ep artm en t, 24, K ingsw ay, London, W.C. 2, to w hich address applica­

tio n should be m ade for th e ap p ro p riate forms. Sim ilar registers are also being established for those hav in g rights and interests in Czechoslovakia an d Poland, since it is also announced th a t th e G overn­

m ent is now willing to represent such claims to th e G overnm ents of those countries.

United Kingdom Mineral R esources The con stitu tio n of th e G overnm ent Com­

m ittee of In q u iry into th e m etalliferous and oth er m ineral'resources of th is co u n try was announced in th e H ouse of Commons earlier this m o n th by th e M inister of F uel and Power. The nam e of th e chairm an, Lord W estwood, was given in our J u ly issue.

The other m em bers of th e com m ittee, which is predom inantly technical, are : Mr. T.

Balogh (In stitu te of S tatistics, O xford

U niversity), Mr. A. R. D avies (a m em ber

of th e firm of Messrs. T. C. H orabin and

P artn ers, industrial consultants), Professor

W. R. Jones, Mr. L. C. H ill (of th e Rio Tirtto

Company), Professor A. O. R ankine, P ro ­

fessor J. A. S. R itson, Mr. S tanley R obson

(of th e Im perial Sm elting C orporation),

Mr. Tom Steele, M .P., C aptain P e te r T horney-

croft, M .P., and Mr. R. E. Y eabsley (a

m em ber of th e firm of Messrs. Hill, V ellacott

and Co., ch artered accountants). The

secretary is Mr. W. C. C. Rose. T he com ­

m ittee is to be know n as th e “ M ineral

D evelopm ent Com m ittee ” and has been

given th e following term s of reference : “ To

inquire into th e resources of m inerals in th e

U nited K ingdom , excepting coal, oil, bedded

ironstone, and substances of w idespread

occurrence ; to consider possibilities and

m eans of th eir co-ordinated, orderly, and

economic developm ent in th e n atio n al

interest, and to m ake recom m endations in

regard th e re to .” No notice has y e t been

given of when th e com m ittee is to s ta r t

work, b u t it will, no d o u b t, first have th e

o p p o rtu n ity of reviewing th e evidence

collected during th e w ar by th e N on-Ferrous

Minerals D evelopm ent C om m ittee appointed

by th e M inister of Supply, of w hich Sir

W illiam Larke was chairm an an d Professor

70

AUGUST, 1946 71 R itson also a m ember. Of this earlier com­

m ittee Mr. T. E astw ood and D r. M.

MacGregor of th e Geological Survey were also m em bers and it seems a p ity th a t th e Survey is n o t represented on th e body now set up. However, th e new Mineral D evelop­

m ent Committee is w orthily con stitu ted and it is to be hoped th a t its w ork m ay have m ore effect on th e G overnm ent’s a ttitu d e to m etalliferous m ining th a n has th a t of others in th e past.

As we have so often pointed out before this country sadly lacks a Governm ent dep artm en t capable of u n dertaking th e ty p e of w ork th a t is carried out by th e B ureau of Mines in America. The U nited S tates’

non-ferrous m ining in d u stry is, of course, v a stly more im p o rtan t th an our own and, as a revenue producer, of more im m ediate interest to its Governm ent. This country, however, has had p ast m ining history and th e o u tp u t of our m ineral fields and the ap titu d e of B ritish engineers have played no sm all p a rt in th e expansion of m ining activities all over th e world. A t present, w ith th e exception of th e surviving Cornish tin industry, there is little th a t would w arrant the form ation of an official organization capable of handling urgent operating problems, b u t from a larger view point we m ay conceive th a t our position, a t th e h eart of an Em pire, m ay be such as to w arran t at least an exam ination of such a project. The B ritish Dominions overseas are quite capable of dealing w ith questions affecting their own m ineral industries ; indeed, we m ight have taken as our m irror Canadian action in this respect instead of the U nited S tates Bureau.

Britain has, nevertheless, wide interests in overseas mining and m any Colonial depen­

dencies looking hom ew ard for support.

A central institution here capable of help­

ing them would do m uch to assure the developm ent and conservation of Im perial m ineral resources.

The suggestion throw n out in the previous paragraph m ay, of course, be thought im practicable. The M inister can, however, do several things to strengthen th e hands of in stitu tio n s already in being. The Geological Survey, for instance, now tak in g a welcome practical outlook on m ineralized areas in this country, m ight well be provided w ith th e m eans of carrying out vital exploratory work. A drilling departm ent capable of testing likely areas could not only confirm geological theory b u t provide tangible evidence of m ineral resources, while the

ab ility to run a bulldozer over an outcrop m ight solve m any a stru c tu ra l problem and give valuable aid in assessm ent work. A t th e same tim e we m ay be pe rm itted to refer once again to th e im portance of fostering fundam ental research in m ineral dressing in this country. This can be done directly by suitably equipping and staffing one of th e laboratories already in existence. M ineral dressing is rapidly changing to m ineral processing and th e change is likely to be accelerated as th e richer deposits become exhausted and complex and lower-grade bodies achieve new im portance as m ineral reserves. If th e establishm ent of a central organization is considered out of th e question then surely these are two practical steps th a t th e new Com m ittee m ight w ith justice recommend. T hey m ight, indeed, be the only steps possible a t th e outset.

British Mining Interests O verseas Mining companies registered in this country have long felt the need of a representative association able to speak for th e in d u stry as a whole and in th e

for Novem ber last it was noted th a t such a body was in process of form ation. The registration has now been approved by th e B oard of Trade of th e B ritish Overseas Mining Association (B.O.M.A.). As readers will recall, a Mining T axation Com m ittee was formed in 1942.

The results it achieved determ ined the leaders of th e in d u stry to create a perm anent organization representative of all overseas m ining interests in this country and the present Association is th e result.

The activities of th e B ritish Overseas Mining Association are intended to cover all m etals and m inerals m ined overseas by companies registered in or directed from this country and one of its prim e functions will be to continue to review th e question of ta x a tio n and to ensure th a t th e benefits of th e in d u stry are not lost to this country for any technical, commercial, or political reason, th e Association being prepared to work in close consultation w ith th e G overn­

m en t on th e strategical aspects involved.

I t will also interest itself in tariff policies as well as in th e com pilation of statistics relating to the mining industry. The Associa­

tion emphasizes its readiness to welcome co-operation w ith other organizations such as th e B ritish N on-Ferrous Metals F edera­

tion, th e B ritish N on-Ferrous Sm elters’