OCR Text |
Show Adding to Gold Supply Gold iii the mountainous clumps of the great Rand mining district of Africa may be saved by the invention of a Johannesburg man. The metal is of such low grade that ordinary methods of extracting It are unprofitable. unprofit-able. Secret experiments, which are said to have been successful, have been stopped pending the taking out of patents. Most of the gold of the world Is now obfained, as In the Rand, by deep mining from quartz rock. The rock is crushed and treated treat-ed by amalgamation, or cyaniding, to recover the gold contained In it. About six pennys" worth of gold are. on the average, recovered from every i ton of rock, and the crushed roi-k Is deposited In large dumps. |