Nature and science on the Pacific coast : a guide-book for scientific travelers in the West . ntre of operationsof the La Grange Mining Company, operating thelargest hydraulic gold mine in the world. The prop-erty is now controlled by the Consolidated GoldFields of South Africa, out is managed, as foryears back, by Pierre Bouery, the genial Frenchmanwho marched with Marchand and has exploredmany of the far places of the earth. The La Grangeis of the type of mines which made Californiafamous and affords the best opportunity to seelarge-scale hydraulic mining. The water usuallypermits mining to
Nature and science on the Pacific coast : a guide-book for scientific travelers in the West . ntre of operationsof the La Grange Mining Company, operating thelargest hydraulic gold mine in the world. The prop-erty is now controlled by the Consolidated GoldFields of South Africa, out is managed, as foryears back, by Pierre Bouery, the genial Frenchmanwho marched with Marchand and has exploredmany of the far places of the earth. The La Grangeis of the type of mines which made Californiafamous and affords the best opportunity to seelarge-scale hydraulic mining. The water usuallypermits mining to continue into or through June. 69 Mines and MiningFrom Redding south, if the route be by the eastside of the valley, or if the traveler come from theeast by way of the Western Pacific, he will see atOroville one of the famous gold-dredging fields. Ofthe total gold production, of about $20,000,000 perannum that California now yields, 37%% is won bythe dredges. These are huge machines mounted onboats floating in ponds, and digging as much as 65feet below water level by means of a continuous. Figure 8The gold dredging region of the Sacramento Valley. chain of heavy steel buckets which scrape up orbreak off the gold-bearing gravel. It is delivered bythe buckets to a big revolving trommel screen fromwhich the fine material passes over rifiles while thecoarse rock is delivered, by means of a belt con-veyor, to the rock pile in the rear. Most of the boatsare held against the bank by steel masts or spudsdropped into the loose ground at the rear of theboat. The dredges are swung backward and for-ward across the face of the cut by wire ropesmanipulated by winches. The whole machine isdriven by electricity. Other important dredgingfields occur east of Marysville, and at Auburn and70 Mines and MiningFolsom near Sacramento. There are a few dredgesin other counties. About half the gold now won in California comesfrom quartz mines. The minor part comes fromhydraulic mines in Trinity, Sierra,
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