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lost mines of southern california: allison mine

lost mines of southern california: allison mine

Did you know that there are over 300 abandoned mines in Los Angeles County and thousands more in surrounding counties? Or that the California gold rush really began right here, in Southern California, years before the discoveryat Sutter's Mill? This website is dedicated to the discovery, documentation & preservation of these legendary mines.

major mines & projects | huckleberry mine

major mines & projects | huckleberry mine

Huckleberry is a classic porphyry copper-molybdenum deposit spatially associated with multiple Late Cretaceous intrusive stocks. Symmetrical zones of Cu-Mo-Ag mineralization and hydrothermal alteration formed around the intrusions.The Huckleberry Main Zone orebody, as defined by the 0.20 per cent copper contour, is rescentshaped in plan, with the arc open to the west. Within this grade shell the mineralized arc length of the deposit is approximately 1400 metres with a width of approximately 400 metres.Mineralization at Huckleberry envelops two Cretaceous Intrusions, the Main Zone Stock and the East Zone Stock. The Main Zone Deposit is kidney shaped in plan, wrapping around the east side of the Main Zone Stock with an arc length of 500 metres, a width of 150 metres, and has been tested up to 300 metres below surface. It is well defined in its southern and eastern edges but remains partly open to expansion on its northern margin. The East Zone deposit was circular in plan prior to dismemberment by faulting, with a concentric shell of mineralization overlapping the contacts of the East Zone Stock.The principal copper mineral at Huckleberry is chalcopyrite, with minor bornite. Molybdenum occurs as molybdenite, which is found as disseminations and as clusters within quartz/gypsum veins. Molybdenite is generally low in chalcopyrite and appears to have been deposited separately and later than the copper mineralization. Gold occurs as discrete grains in embayments in chalcopyrite and pyrite. Although concentrations of gold and silver are low, precious metals nonetheless contribute a portion of the revenue stream.

Huckleberry is an open pit copper/molybdenum mine. The loading equipment is a combination of a P&H2100 electric shovel, Komatsu PC2000 and PC3000 excavators, and Caterpillar 992 loaders. When in operation, the haulage fleet includes Caterpillar 777Cs,785Bs and 785Ds.

Ore from the pit is delivered to a 42x 65 gyratory crusher and after crushing is conveyed to a stockpile. Ore from the stockpile is ground in two stages prior to flotation, firstly in a single 10,000hp SAG mill, and secondly in two 5,000hp ball mills. A bulk copper concentrate is floated from the ball mill product. The bulk copper concentrate is then reground in a 1,500hp regrind mill, and then floated again to produce a final copper concentrate grading approximately 27% copper. Molybdenum concentrate is floated out of the copper concentrate.

lost mines of southern california: stanley-miller mine - first attempt

lost mines of southern california: stanley-miller mine - first attempt

Did you know that there are over 300 abandoned mines in Los Angeles County and thousands more in surrounding counties? Or that the California gold rush really began right here, in Southern California, years before the discoveryat Sutter's Mill? This website is dedicated to the discovery, documentation & preservation of these legendary mines.

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