2009-05-19_REVISION - M1981021 (36)

Home Browse Search

2.0 Potential for Adverse Impacts HRMMR § 6.4.20(1) provides for evaluation of potential adverse impacts associated with designated chemicals, toxic- or acid-forming materials, or acid rock drainage at mine facilities. This section identifies facilities present at the Sunday Group Mines in relation to the requirements of HRMMR § 6.4.20(1), and presents general discussion regarding the potential for these facilities to contain designated chemicals, toxic- or acid-forming materials, or acid rock drainage. 2.1 Description of Specified Mine Facilities HRMMR § 6.4.20(1)(c) sets forth various types of mine facilities that require specific evaluation for the presence of designated chemicals and acid- or toxic-forming materials. Exhibit 2-1 describes the types of specified facilities that are present at the Sunday Mines Group in relation to HRMMR § 6.4.20(1)(c): Exhibit 2-1. Summa of the Status of Specified Facilities at the Sunda Mines Grou Specified Facilities Facility Status Leach facilities, or heap leach pad Not Present Tailings storage or disposal areas Not Present Impoundments Not Present Waste rock piles (development rock stockpiles) Present Stock piles, temporary or permanent Present Land application sites Not Present Only development rock stockpiles and temporary ore stockpiles are present at the Sunday Mines Group. These stockpiles are comprised primarily of Top Rim sandstone. It is commonly medium grained, well rounded, gray sandstone with calcite cement. The grain size of the rock particles ranges from fine sand to boulders. The medium diameter is approximately 2 inches based on a general visual evaluation. Local zones also contain reddish-brown calcareous sandstone, which was mined from units adjacent to the Top Rim sandstone. Development rock is rock that must be excavated to facilitate mine development, but that does not contain adequate metals content to constitute ore. Development rock piles are located at each of the individual mines that compose the Sunday Mines Group. Ore is rock that contains sufficient uranium and vanadium to warrant processing at the Denison mill near Blanding, Utah. Temporary ore stockpiles are currently located at the Sunday, St. Jude, West Sunday, and Topaz mines; the temporary stockpiles are typically transported to the mill on a daily to weekly basis. Exhibit 2-2 describes the type, status and size of specific facilities at each mine within the Sunday Mines Group. E 2-1 T:164986-Denison Mines\Task Order 4 - EPP Sunday Mines GroupTINAL EPPTINAL - Environmental Protection Plan Sunday Mines.doc