2020-08-07_GENERAL DOCUMENTS - C1981010

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Utah International Inc. began exploration drilling operations for Trapper Mine in 1954 to obtain geologic information on the structure of coalbeds and estimates of mineable coal reserves. In 1973, Utah International Inc. and four electric utilities signed a contract for delivery of coal to fuel the Craig Generating Station. This coal delivery obligation of approximately 111 million tons over a 52 year period required strip mining six to seven thousand acres of land since the mining activities began in 1976. Environmental studies for the Trapper Mine began in 1972 and intensified in 1973 and 1974. Most of those studies will continue throughout the life of the project. Trapper Mine endeavors to reclaim disturbed lands to as good as or better condition than before mining. A high priority is attached to the reclamation programs, all of which are designed to protect wildlife,water, air quality and other environmental resources of the mine area. The shop and warehouse buildings were completed in November 1975,while the office complex was completed in November of 1976. The construction of the first of three, 30 cubic yard walking draglines started in February 1976. Actual mining operations began in May, 1977, and coal deliveries started in August 1978. The original owner of Trapper Mine was Utah International, Inc. an international mining company. All initial permitting and mining efforts were performed by Utah International. In July 1982,Utah International formed the subsidiary, Trapper Mining Inc. to consolidate and hold the properties and rights that make up Trapper Mine. The owners of the Craig Generating Station,the electric utility receiving its coal from Trapper Mine,purchased Trapper Mining Inc. in July of 1983. For additional information about the history of the permit application,please see Permit Renewals RN6 and RN7 available in DRMS's document management system previously referenced. This findings document replaces Trapper Mine's previous findings document associated with Permit Renewal RN6, RN7 and Midterm Review MT6. Please note that much of the information in this document is derived from those previous documents. The Review Process: Permit History and Revisions The following revisions have been submitted since the last midterm review(MT8) dated June 16, 2020. For details regarding the revision history between Permit Renewal RN7 and MT8 please refer to the MT8 findings documents available on the Laserfiche weblink here: hgps://dnrweblink.state.co.us/drms/search.aspx?cr=1 Table 1-1: Minor Revisions MR Submittal Proposed Decision Date Permitting Action MR225 6 June 2020 Three Groundwater Monitoring Wells 4