Predictive Mineralogy

Possible unrecorded species at Brewster County Consolidated Mine (Study Butte Mine; Rainbow Mine; Big Bend; Texas-Almaden), Study Butte, Brewster County, Texas, USA

This table is based on statistical analysis of other localities containing similar species to the ones found at this locality.

Possible missing species	Formula	Match %	Due to recorded presence of
Quartz	SiO₂	99.78%	Alunite (61.80 %), Calcite (62.43 %), Cinnabar (52.07 %), Jarosite (68.17 %), Marcasite (70.46 %), Pyrite (67.27 %)
Chalcopyrite	CuFeS₂	73.12%	Jarosite (50.73 %), Marcasite (63.89 %), Pyrite (51.72 %)
Sphalerite	ZnS	52.68%	Marcasite (65.85 %)
Kaolinite	Al₂(Si₂O₅)(OH)₄	51.68%	Alunite (51.69 %)
Galena	PbS	46.98%	Marcasite (58.73 %)

Key: Mineral matches key element mineralogy of deposit Key element(s) in mineral not listed for deposit (-20% score)

Predicting paragenetic modes of deposit

Green indicates almost certain match based on minerals unique to a certain deposit type. Yellow indicates a possibly poor match, but should not be entirely discounted. Scores > 100 indicate strong confidence.

Paragenetic Mode	Score
49 : Oxic cellular biomineralization (see also #44)	50
11 : Volcanic fumarole minerals; reduced phases (see also #45)	49
47b : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Sulfates and sulfites]	49
47a : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Near-surface hydration of prior minerals]	49
46 : Near-surface hydrothermal alteration of minerals (see also #22)	49
45a : Oxidized fumarolic minerals (see also [#11]) - [Sulfates, arsenates, selenates, antimonates]	49
6 : Secondary asteroid phases	37
12 : Hadean hydrothermal subsurface sulfide deposits (see also #33)	36
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])	36
56 : Slag and smelter minerals (see also #51 and #55)	36