Host-rocks : Black fetid Namurian bituminous limestones (700 meters thick).
Complex mineralization with three successive primary stages and an important later supergene stage:
1) Pyrite-marcasite-bravoite: Co/Ni sulfarsenides and arsenides in dolomite; associated with acanthite. Cobaltite, Safflorite, gersdorffite.
2) Intermediate stage: Tennantite and sphalerite in quartz/dolomite.
Renierite. Chalcopyrite (with briartite inclusions) and talnakite replacing early assemblage. Tennantite and sphalerite replace cobaltite and safflorite.
3) Cu/Fe sulphides: Chalcopyrite, talnakite and bornite. Chalcocite, djurleite, digenite, covellite.
4) Oxidation sequence: Cementation copper sulfides, native elements and oxidation minerals.
Production and reserves: 200,000 tons extracted.
400,000 tons ore reserves @ 1-3% Ni and 1-3% Co, 1-20% Cu.
Paniagua, A. et al (1988) Bull. Minéral: 111: 383-391.
30 entries listed. 28 valid minerals.
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
This page is currently not sponsored. To sponsor this page click here.
|Fade toolbar when not in focus||Fix toolbar to bottom of page|
|Hide Social Media Links|
|Slideshow frame delay||seconds|
Locality Updated: Pint's Quarry, Raymond, Black Hawk Co., Iowa, USAFrom E. L. Clopton, 9th Mar 2014 17:32:31