Larsen, E.S. (1942) Alkalic rocks of Iron Hill, Gunnison County, Colorado. Shorter contributions to general geology, 1941-42. United States Geological Survey Professional Paper 197-A.

Armbrustmacher, T.J. (1981) The complex of alkaline rocks at Iron Hill, Powederhorn district, Gunnison County, Colorado. in 32nd Field Conference New Mexico Geological Society: 293-296.

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	*Horick, Paul J. (1974) The Minerals of Iowa. Educational Series* 2. Iowa Geological Survey**	Report (issue)
	constantly evolving as man digs and probes the earth. Whenever a quarry is opened or an old one deepened...................................... Muscovite Biotite Pyroxene Augite Zeolites Other minerals reported...3) 4) 5) 6) Upper Mississippi Valley zinc—lead district Mineral crystals, isometric ....................pocket) Page 82 83 85 Plates Page Page 4) A. White calcite crystals on brown calcite in vugs in dark...dolomite and white calcite crystals on light brown calcite. C. Aragonite in shells. D. White to colorless
	*(1993) International strategic minerals inventory summary report; niobium (columbium) and tantalum. Circular* 930. US Geological Survey doi:10.3133/cir930m**	Report (issue)
	930-M) "Prepared as a cooperative effort among earth-science and mineral-resource agencies of Australia...N65C68 1993 333.8'5465-dc20 92-41231 CIP FOREWORD Earth-science and mineral-resource agencies from several...tantalum---------------------------------------Mining and processing - - - - - - - - - - - - - - - -...- - - - - - - - - - - - - - - - - - - - Niobium mining and processing - - - - - - - - - - - - - - - -...- - - - - - - - - - - - - - - - - - - Tantalum mining and processing- - - - - - - - - - - - - - - - -
	Canil, Dante, Grondahl, Carter, Lacourse, Terri, Pisiak, Laura K. (2016) Trace elements in magnetite from porphyry Cu–Mo–Au deposits in British Columbia, Canada. Ore Geology Reviews, 72. 1116-1128 doi:10.1016/j.oregeorev.2015.10.007	Journal (article/letter/editorial)
	3, Terri Lacourse2, Laura K. Pisiak1 School of Earth and Ocean Sciences, University of Victoria, Victoria... BC, Canada 3 current address: Department of Earth Sciences, University of Toronto, Toronto, ON, MA...between magnetite from skarn and NU porphyry deposit settings. The heterogeneous composition of hydrothermal...set ACCEPTED MANUSCRIPT 4 from the Ertsberg deposit (Indonesia) with trace elements determined by electron...from eight deposits in New Mexico and Arizona, PT USA employing LA ICPMS. The latter work showed considerable

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Biotite from Iron Hill deposit, White Earth Mining District (Powderhorn Mining District), Gunnison County, Colorado, USA

Biotite from
Iron Hill deposit, White Earth Mining District (Powderhorn Mining District), Gunnison County, Colorado, USA