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6.4 Poverty Gulch <br /> Groundwater sampled in the Poverty Gulch monitoring wells (PGMW 1A-200 and PGMW 16-55) has <br /> elevated manganese and zinc. PGMW 1A-200 has slightly elevated sulfate, and PGMW 16-55 has <br /> anomalously low pH. The wells are very close to the Precambrian-diatreme contact, and appear to be <br /> within the footprint of Precambrian rocks. <br /> The first regular producing mine in the Cripple Creek district was the Gold King, which produced ores with <br /> little oxidation (Lindgren and Ransome, 1906). The C.O.D. mine was also one of the earliest mines in the <br /> district, having commenced production prior to 1894, and the Abe Lincoln began production in 1895 <br /> (Lindgren and Ransome, 1906). The Mollie Kathleen was staked in 1891 (www.goldminetours.com), but <br /> no information regarding when the mine began production was available. Both the C.O.D. and Mollie <br /> Kathleen produced unoxidized ores, and in the case of the Mollie Kathleen, the ore included galena (lead <br /> sulfide) and sphalerite (iron-zinc sulfide). No information regarding the production history or the nature of <br /> the ore mined in the Chicago Tunnel was available. <br /> Figure 36 shows the location of the Poverty Gulch monitoring wells on a 1991 aerial image and on a <br /> portion of Plate 1 from Lindgren and Ransome (1906). It is evident that the monitoring wells are down- <br /> gradient and in close proximity to the historic mines. The modern open pit and heap leaching operation <br /> shown in the lower right of the aerial image began in 1978. <br /> ♦J <br /> ' r <br /> Feet . : ^� � X a <br /> Gbtd King s _J o U� • i <br /> Vw <br /> 'Chicago Tunnel ,'..gip=�f (��°� yrf a 't <br /> Abe Lincbin <br /> Lillie\ 1 PGW. <br /> PGMW 2 ,'r:.`� <br /> Figure 36: Poverty Gulch in a 1991 aerial image(left)and on a portion of Plate 1 from Lindgren and Ransome <br /> (1906). The current compliance monitoring wells are shown with a red dot and the label PGMW 1. The <br /> Precambrian-diatreme contact is shown by the red dashed line. <br /> Figure 37 is a photograph looking up Poverty Gulch from a point just south of the Lillie (spelled Lily in <br /> Lindgren and Ransome, 1906) showing the mines in the period 1907-1915 (www.mtgothictimes.com). <br /> The Lillie is closest, followed by the Abe Lincoln, Chicago Tunnel, and C.O.D. The Gold King was located <br /> off the upper left of the image. Stars have been placed at the approximate locations of the current and <br /> abandoned Poverty Gulch monitoring wells, using features in the photograph as well as Plate 1 from <br /> Lindgren and Ransome (1906), 1951 USGS 1:24000 topography, and a 1991 aerial image. <br />