VMS Deposits in Central Arizona
October 2004 by John RothermelVolcanogenic Massive Sulfide (VMS) deposits in the Central Arizona Precambrian volcanic belt occur within a felsic package of volcanic rocks capped by an exhalite unit comprised of cherts, iron formations and siliceous members.
It was June 6th, 1999 at 7:00 am when I started hiking to the river with my final load of dredge equipment. Hearing the flow of water in the South Fork of the Yuba River and the call of birds up and down the canyon, I added some whistles of my own just to annoy the nearby birds.
• Dear Palestinian Bomber…
• Not what we had in mind...
• The high price of poverty
• Wipe that smile off your face
The Northwest Mining Association reports that the claim maintenance fee for 2004-2005 will be raised.
Lately my mind has been involved with group 4 of the transition elements, namely titanium, zirconium, and hafnium. They all have similar chemical properties. Of greatest interest to economic geologists and miners is that these valuable elements often occur together in sands.
June 18, 1955 — August 3, 1999
Perhaps the most notable thing about skim placers is that they form on the top surface of gravel bars, as opposed to coarser gold placers where the weight of the gold particles allows the gold to settle down on or near bedrock.
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