Gold Deposits in Skarn
July 2003 by Edgar B. Heylmun, PhDSkarn consists of coarse-grained calcium, magnesium, iron, and aluminum silicates formed by hydrothermal solutions, which replace limestone or dolomite near the contact with an igneous intrusion. The contact metamorphism is usually caused by an intrusion such as quartz monzonite, granodiorite, or similar rock type, which may or may not be mineralized.
• Don't go in the water...
On July 4, we are reminded of the sacrifices our Founding Fathers made to establish this great country of ours, and in that spirit, the Minerals and Mining Advisory Council (MMAC) has created a draft Declaration of Miners.And MMAC has been hard at work writing a bill, with the unwavering support of several members of Congress, to reaffirm the rights of miners operating in traditional mining districts.
Rivers are not just random and accidental; streams and other drainages are what they are because of the forces of erosion acting on the bedrock.
Robert A. Sanregret
1930 - 1999
If there was one word that characterized news events of the past month it was “uncertainty.” Would the United States hand over the government of Iraq to the newly-installed leadership? Would the Fed at long last raise interest rates, and, if so, by how much? Would the new pattern of sabotage against oil pipelines in Iraq...
• Obama’s parting shots
• California suction dredging
• Oregon follows California’s lead
• Lawsuit coming; bill introduced to stop mining in Washington State
• President Trump halts new federal regulations
Jasperoid is a jasper-like siliceous rock, in which chalcedony or cryptocrystalline quartz has replaced limestone, dolomite, or shale. It forms the gangue of many important ore bodies. It is stained by iron and manganese oxides into shades of...
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