Report of the State Mineralogist . grade hematite was mixedwith the magnetite to give an average iron content of 55% in the PLACER COUNTY. 453 furnace charge. The furnace produced 30 to 35 tons of pig iron a for a period of three months required for rebuilding* the plantafter a fire, the furnace is said to have been in steady operation forthe five years. The pig iron was of high quality, and brought a price of about $35a ton. It was used by the Southern Pacific Company for car wheelsand axles. The property was closed largely on account of the compe-tition of cheaper Alabama pig iron
Report of the State Mineralogist . grade hematite was mixedwith the magnetite to give an average iron content of 55% in the PLACER COUNTY. 453 furnace charge. The furnace produced 30 to 35 tons of pig iron a for a period of three months required for rebuilding* the plantafter a fire, the furnace is said to have been in steady operation forthe five years. The pig iron was of high quality, and brought a price of about $35a ton. It was used by the Southern Pacific Company for car wheelsand axles. The property was closed largely on account of the compe-tition of cheaper Alabama pig iron, which undersold the local productin the San Francisco market. The iron ore is not thought to beworked out, but the grade of ore remaining available would be consid-erably lower than that heretofore smelted unless new bodies of ore,now unknown, are found. There are several other small iron oredeposits in the vicinity of the Hotaling mine, and when the old furnacewas running, the low-grade ores from these were often mixed with the. Photo No. 56. Pit and Sluice, Australia Hydraulic Mine, near Spanish Ranch, Plumas County. higher grade ore from the Hotaling mine and smelted in smallquantities. LIMESTONE. There are many deposits of limestone in the county, but none of themare being worked at present. The Dunlap Property. Address Bout well Dunlap, Auburn. Thisis the westerly portion of the large lens that is being worked by theMountain Quarries in Eldorado County. This lens is cut in two partsby the Middle Fork of American River. The Dunlap property is onthe Forest Hill road, five miles from Auburn. It is the southernmostof a series of limestone bodies that outcrop at intervals to within amile of Clipper Gap. Another belt of detached limestone outcrops extends from theNorth Fork of American River northwest of Butcher Ranch, toApplegate. The most accessible of this group is the Spreckels 154 MINES AND MINERAL RESOURCES. Deposit, owned by the Spreckels Sugar Company, Spreckels, Calif
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
