|Note visible gold (distinct yellow) surrounded by pyrite (brassy to silver |
metallic material). Core from the Copper King gold-copper mine, Wyoming.
Looking to find gold? You've come to the right place
|Gold in Arizona - book is in preparation and hopefully will be done and published in 2017.|
|Rock foliation in the Archean age Miners Delight formation metagreywacke|
along Rock Creek in the South Pass greenstone belt, provide excellent
natural riffles to trap gold where they crosscut the Rock Creek placer.
|Gold in milky quartz vein material made as inlay in this match |
box apparently owned by the Lost Dutchman.
Take a close look at this sample. It was one of many found by
field trip attendees on my past field trips to South Pass.
Everything you see that is gold colored in the rock is gold.
This was found at the Carissa mine.
Schematic showing development of meander. Where the stream starts to meander, water velocity decreases & minerals with higher specific gravity concentrate (stippled areas). Through time, the meander may mature, leaving deposits on the inside banks as the stream migrates. Material in the stream as well as the adjacent bank material (which may be high and dry after episodes of flooding and high water) will contain heavy minerals & possibly gold and diamond.
|Wayne Sutherland, WSGS geologist, examines paleoplacer at Dickie Springs to the south of South Pass. Note all of the rounded boulders and cobbles typically found in active streams and rivers.|
|Classic lode. This auriferous quartz vein in metatonalite at the Mary Ellen |
mine at South Pass was offset along a small, reverse fault. Lodes are considered
in situ deposits in hard rock
Gossan at Red Mountain in the San Juan Mountains,
southern Colorado. Note all of the red to light
yellow-colored rock found nearly everywhere in the photo.
These are gossans that contain significant amounts
of gold and silver.
|The Carissa mine at South Pass. The shear zone in the background is rich in gold [average grade reported at 0.3 opt Au, much higher than the ore currently recovered from mines in Nevada (0.02 to 0.15 opt Au) (opt Au= ounces per ton of gold)]. Although not visible to the untrained eye, this giant gold-bearing structure lies in a large fold in the shear. The ore zone is 970 feet long, nearly 1,000 feet wide and continues to a minimum depth of 930 feet (and likely a few thousand feet deep). The property was withdrawn by the State of Wyoming even though it very likely hosts a few million ounces of gold worth a few $billion.|
|Fisher dredge on Rock Creek, South Pass, Wyoming showing unmined ground|
|Stacked pay gravel on Rock Creek placer, South Pass.|
Note the distinct clay and silt false bedrock layer. The
gold occurs in the gravels above and below the false
bedrock. The clay and silt represent a very dry period.
Pyrite (fool's gold). Note the brassy color (not gold colored).
Pyrite is brittle and the upper photo shows crystalline (cubic)
pyrite. Upper specimen from the Lost Muffler gold prospect,
Rattlesnake Hills and lower specimen from the Pickwick
vein, Kirwin district, Wyoming. But don't throw them away:
pyrite can contain a few hundred parts per million to potentially
2,000 ppm (64 ounces per ton) hidden in its crystal structure!