Document 9324Lz9O15MoarDqpmwM46NGL
PLAINTIFF'S EXHIBIT
JMMC-306
RECOVERY OF RAW ASBESTOS
At The Havelock Mine
By Boland- Starkey M. Inst. it/. it/. Consulting Engineer, and Staff of African Associated Mines, Limited
Reprinted from May 1947 "Asbestos" Philadelphia, Pa.
RECOVERY OF RAW ASBESTOS
Methods Used at Havelock Mine
By Boland Starkey M. Inst. M. M. Consulting Engineer, and Staff of African Associated Mines, Limited
Production of chrysotile asbestos from the Havelock Mine began in June, 1939 and the milling methods adopted were the result of a considerable amount of experience and research by technicians of Turner & Newall, Ltd., both from their mines in Africa and from their factories in the United Kingdom.
The Havelock Mine is situated in Swaziland a few miles over the Eastern border of the Transvaal. It is owned by New Amianthus Mines, Ltd., a subsidiary company of Turner & Newall, Ltd., of Rochdale, England.
About one quarter of the ore delivered to the mill bins is derived from opencast quarrying operations and the re maining three quarters is broken in underground sub-level caving st'opes.
The first operation in the mill is of sizing and hand sorting. The rate of flow from the mill bins is 110 tons per hour and a rotating ring grizzley gives a --4 inch product; the "througlis" pass to trommels clad with steel punehedplate with circular holes of 21/? inch diameter. Fibre bear ing rock present in the -f4 inch, and --1 inch +2% inch products, is picked off sorting conveyor belts by hand and the remaining barren waste rock is disposed of forthwith via waste bin and dump haulage. This sorting operation yields a product known as Hand Cobbed Fibre constituting approximately 3% of the original feed; the coarse waste discard to dump amounts to 50%.
The --2Va inch product from trammelling contains moisture varying from 4% to a maximum of 33%, the average content being from 8% to 9%. and before further treatment can take place it is necessary to ai range to dry
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