This form of mining was pioneered on the basalt plateau around Ballarat by skilled tin and coal miners from Cornwall Wales and Scotland The process involved sinking a main shaft where possible in solid ground and extending tunnels from this underneath the old buried riverbeds called leads Vertical connections were made at intervals to the leads and the ancient gold bearing gravels
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Get PriceIn addition to the magmatic sulfide mineralization system massive gold bearing boulders of native iron have been found on the company s licences specifically the 10 tonne Hammer Dal Boulder providing another significant target for iron nickel copper cobalt platinum group elements gold mineralization
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Get Priceduring construction of the mine by bhp australia coal pty ltd in 1993 when shaft sinking and development employees were sinking the upcast ventilation shaft a rare find was made 1 after digging through the thin surficial sands and clays followed by tertiary basalt 21 m down pieces of fossilised wood were found entombed in the basalt near the …
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Get PriceExperimental results on the thermophysical properties as shown in Figure 2 represent that the thermal conductivity of the basalt samples ranges from to Wm −1 ·K −1 and thermal diffusivity ranges from to mm 2 ·s −1 whereas volumetric heat capacity ranges from to MJm −3 ·K −1
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Get PriceKeywords basalt ASTER satellite image basalt extraction index classification 1 Introduction Lavas are formed through the exit of magma as well as molten and semi fluid minerals from the mantle to the Earth s surface Basalt as a typical example of lavas contains 50 54% of silica and less than 10% of calcium and potassium feldspars In
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