Geology & GeoMetallurgy

Geology & GeoMetallurgy2017-04-04T06:58:01-04:00
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Help with mineral identification in the field (3 replies and 1 comment)

2 years ago
Nugget-hunter 2 years ago

identification of nugget of native metal found on the edge of granite country in northern Queensland Australia.

SG of 5.4 and does not attract a magnet.



2 years ago
Terrance 2 years ago

Look's like platinum ore .Gabbro and norite are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with or without olivine. In gabbro the dominant ferromagnesian mineral is clinopyroxene, whereas it is orthopyroxene in norite. The expression “gabbroic rocks” includes both gabbro and norite. Gabbro is the coarse-grained, plutonic equivalent of basalt and dolerite.Platinum is found in norite intrusive rocks

2 years ago

Should explain that I was out swinging my detector for gold that weekend as there is an abandoned mine nearby, this specimen was found at our camp by the kids, who obviously don't remember where.
It weighs 90grams.
I have the gear to crush wash and melt our gold nuggets and specimens but don't know how to process this.
If mostly free metal it will be the same but have heard that my graphite cups will react with PGE metals.
Any ideas on this?

2 years ago
Terrance 2 years ago

I must add this also look's like Chromite ore and that also contains PGE's



2 years ago
Terrance 2 years ago
1 like by David
Process for extraction of platinum group metals from chromite-bearing ore
US 4295881 A
A process for treating chromite-bearing ores to obtain useful mineral values, especially platinum group metal, therefrom wherein the ore is separated into magnetic and non-magnetic fractions; the non-magnetic fraction, containing a substantial portion of the platinum group metals, is concentrated and smelted to produce a metal layer containing platinum group metals; and the platinum group metals are then substantially disassociated from the metal layer containing them. The magnetic fraction of the ore may itself be further treated to remove any platinum group metals associated therewith.

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