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including the Bessie G mine (Saunders and May, 1986) <br /> The May Day Idaho mine complex is located on the southern flank of the La Plata Mountains; <br /> represent some of the oldest and most productive mines in the La Plata mining district. Mining <br /> on these properties started in 1902 and continued until around 1937. During this early period <br /> the mines produced around 133,000 ounces of gold, 1,140,000 ounces of silver, 24,000 pounds <br /> of lead, 8,000 pounds of zinc, and 1,500 pounds of copper (Eckel, 1949; Neubert, 1992). <br /> The May Day mine alone produced approximately 75,000 ounces of gold and 759,000 <br /> ounces of silver. There have been several attempts to explore and mine the deposits on this <br /> property since World War II, as well as the present operation. <br /> The precious-metal deposits in the La Plata Mountains are telluride mineralization associated <br /> with potassic igneous rocks(e.g. Mutschler and others, 1991, 1992; Mutschler and Mooney, <br /> 1993: Richards, 1995; Kelly and Ludington, 2002). The deposits in the La Plata district <br /> represent the most recognized Au-Ag telluride deposits in southwestern Colorado. Recent <br /> work in the deposits of the May Day Mine has revealed a complex history of mineralization <br /> involving an early phase dominated by base metals which was followed by a later stage of Au- <br /> Ag mineralization. (G o n z a l e s, 2 01 1 ) <br /> Access to the La Plata district mining district is excellent. Major highways and roadways <br /> allow access to the May Day-Idaho mine complex. <br /> 3.0 PURPOSE <br /> The primary purpose of this study is to characterize surface and ground water and provide a <br /> conceptual model of ground water flow in the general vicinity of the May Day Idaho Mine <br /> Complex. The secondary purpose of the conceptual model is to provide a postulated flow regime <br /> description that accommodates discharge from the Idaho No. 1 mine portal and to describe <br /> potential sources of that discharge. The majority of the data for this study is from literature and <br /> collected water quality data as noted in the document. In addition; specific additional <br /> information regarding onsite conditions was provided by Dr. David Gonzales which he provided <br /> (anecdotal personal communication). <br /> 4.0 GEOGRAPHY <br /> The area in question is located on the nose of a southerly sloping hillside bounded on the <br /> southeast by Little Deadwood Gulch and on the west by the La Plata River. The elevation <br /> increases in a northerly direction to the La Plata River drainage divide which is located <br /> approximately 8 miles north of the mine. <br /> The May Day No.I and No. 2 and the Idaho No. 1 and No. 2 Mine Portals are located in the <br /> Little Deadwood Gulch watershed that drains into the La Plata River(See Figure 2). <br /> May Day Idaho Mine Complex <br /> M-1981-185 <br /> January 19, 2017 <br /> Page 1 -5- <br />