	Cadigan, Robert Allen, Felmlee, J. Karen (1979) Radioactive springs geochemical data related to uranium exploration: basic data and use of multivariate factor scores. Open-File Report Vol. 1979 (79-1302) US Geological Survey doi:10.3133/ofr791302	Report (issue)
	DEPARTMENT OF INTERIOR GEOLOGICAL SURVEY Radioactive Springs Geochemical Data Related to Uranium Exploration... CONTENTS Page Abstract 1 Introduction- 2 Area of study 2 Data 5 Mineralogy 5 Factors controlling...Page Figure 1. Sample localities of selected springs and flowing or pumped wells- 2. Scattergram of...precipitate sample data 28 11 Radioactive springs geochemical data related to uranium exploration...Center, Box 25046, Denver, Colorado 80225 ABSTRACT Radioactive springs and wells at 33 localities
	Van Alstine, Ralph Erskine, Cox, D.C. (1969) Geology and mineral deposits of the Poncha Springs NE quadrangle, Chaffee County, Colorado, with a section on Fluorspar mines and prospects. Professional Paper 626. US Geological Survey doi:10.3133/pp626	Report (issue)
	Mineral Deposits of the Poncha Springs NE Quadrangle, Chaffee County,Colorado By RALPH E. VAN ALSTINE... PAPER 626 Prepared in cooperation with the Colorado State Mining Industrial Development Board UNITED...Ralph E. Van Alstine and Doak C. Cox _________ _ Colorado-American mine ______________ -_Delay adit and...Geologic map of the Poncha Springs NE quadrangle. Geologic map of the Colorado-American fluorspar mine...district. Geologic map of underground workings, Colorado-American fluorspar mine. Longitudinal section
	Cadigan, R.A., Felmlee, J.K. (1982) Radioactive mineral spring precipitates, their analytical and statistical data and the uranium connection. Open-File Report Vol. 1982 (82-743) US Geological Survey doi:10.3133/ofr82743	Report (issue)
	showing physiographic province boundaries and general area sampled...........................................19 4. Composite photograph of Doughty Springs site, Colorado..........20 5-8. Photographs showing:................... 5. Precipitates at Doughty Springs................................. 21 6. Travertine...Soda Springs sites, Colorado....................... 23 7. Precipitates at Wilson Health Springs, Utah...Travertine deposits at Soda Dam Springs, New Mexico and Poncha Hot Springs, Colorado...................25 9-12
	Bove, Dana, Felmlee, J.K. (1982) Mineralogy and autoradiography of selected mineral-spring precipitates in the Western United States. Open-File Report Vol. 1982 (82-792) US Geological Survey doi:10.3133/ofr82792	Report (issue)
	............................................. 2 Area of study..........................................iron oxides, including romanechite, manganite, pyrolusite, goethite, and hematite, were found in some of...molecules. Introduction Purpose of study Mineral springs have fascinated mankind for centuries and have...science sought to determine the origin of such springs and found ways to utilize the water or precipitates...as possible geothermal energy sources. Thermal springs have been Minerals precipitated by spring waters
	*, (1980) Geological Survey research 1980. Professional Paper* 1175. US Geological Survey doi:10.3133/pp1175**	Report (issue)
	Canada __________________________________ Caribbean area ____________________________ Egypt ____________..._________________________angstrom ABAC ______Association of Bay Area Governments ac ___________________alternating current...______________________atmosphere b ________________________barn (area) bbl __________________________barrel BIA _______________Bureau...___kilobar KCLA _____________Known Coal Leasing Area KeV ____________________kiloelectronvolt kg ___...kilogram KGRA _______Known Geothermal Resources Area KGS _____________Known Geologic Structure kHz _
	*, (1980) Two Cenozoic igneous events on the Alaska Peninsula: A section in Geological Survey research 1980. Professional Paper* Vol. 1175. US Geological Survey doi:10.3133/70180407**	Report (volume)
	Canada __________________________________ Caribbean area ____________________________ Egypt ____________..._________________________angstrom ABAC ______Association of Bay Area Governments ac ___________________alternating current...______________________atmosphere b ________________________barn (area) bbl __________________________barrel BIA _______________Bureau...___kilobar KCLA _____________Known Coal Leasing Area KeV ____________________kiloelectronvolt kg ___...kilogram KGRA _______Known Geothermal Resources Area KGS _____________Known Geologic Structure kHz _
	*Butt, C.R.M., Wilding, I.G.P. - Eds.* (1977) Geochemical Exploration 1976 - Developments in Economic Geology No. 9. Elsevier. doi:10.1016/b978-0-444-41653-7.x5001-x**	Book
	— Dr. A.L. Mather, Mr. N.J. Marshall, Dr. M.A. Chaffee and Dr. D.H. McKenzie and to all those who contributed...Exploration Symposium is to be held in Golden, Colorado, U.S.A. in April 1978 and we look forward to another...Sulphide deposit A is assumed to overlie source area of base metal sulphides. (Derived from Wahl, 1977...(deposit A, Fig. 5) which may flow from the source area to a nearby depression (deposit B, Fig. 5). These...would identify mineral exploration as a priority area — without diminishing freedom of individual choice

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Pyrolusite from Poncha Hot Springs, Poncha Pass Area, Chaffee County, Colorado, USA

Pyrolusite from
Poncha Hot Springs, Poncha Pass Area, Chaffee County, Colorado, USA