Abstract The Young Mine, of which the Beaver Creek Mine is a part, is located in Jefferson Co., TN on U.S. Highway 11-E between Strawberry Plains and Jefferson City. It is the largest of ASARCO’s mining operations in the East Tennessee Division. Located in the center of the Mascot – Jefferson City zinc district, it lies within the Valley and Ridge Provence. The mineralization is situated in the lower Mascot – upper Kingsport formations of the Knox Group (Lower Ordovician). The mine is atop a physiographic domal structure known locally as Hodges dome. Geographically, it lies between two low-angle thrust faults: the Mill Spring to the north, and the Rocky Valley to the south. The structure is cut by numerous high- angle faults, most of which exhibit minor to moderate vertical and/or horizontal displacement. The Beaver Creek portion of Young Mine is located on the west flank of this domal structure.

Abstract The morning portion of this trip traverses mainly Lower Ordovician Knox Group strata and makes a close encounter with the Rocky Valley overthrust fault enroute to American Smelting and Refining Company’s (ASARCO) Young mine and mill complex ( Stop 3 ). The Young mine, located near the center of the Mascot-Jefferson City zinc district, is the largest of the operating mines. The ore occurs mainly in collapse breccias which will be observed during an underground tour led by ASARCO staff. Access may possibly be by way of the Beaver Creek shaft. The afternoon portion of this trip will cross a wide-expanse of typical Valley and Ridge geology and topography before reaching the gentle structure of the Powell River anticline with its numerous zinc and lead occurrences. The largest of these, the New Prospect mine, is Stop 4 . Here the mineralization occurs in Maynardville Limestone along fault and shear zones rather than in collapse breccias. On the return to Morristown the trip passes the well-known Thom Hill section where the roadcut for highway US-25E traverses well-exposed strata from lower Cambrian Rome Formation to lower Mississippian Grainger Formation. A short stop will be made at the top of Clinch Mountain to observe the wide expanse of the valley of East Tennessee that stretches all the way southeast to the Smoky Mountains. It also presents an opportunity to take a look at the Clinch Sandstone. The return to Morristown crosses several belts of mostly Lower Paleozoic formations as well as several arms of Cherokee Lake.

Abstract The Young Mine is located in Jefferson County, Tennessee, on U.S. Highway 11-E about 15 miles (25 kilometers) northeast ofKnoxville. It is situated near the center of the Mascot - Jefferson City zinc district which lies within the Valley and Ridge Province. Sphalerite deposits occur within the Kingsport and Mascot Formations, located in the upper part of the Lower Ordovician Knox Group. The mine is located atop a physiographic do mal structure known locally as Hodges dome (Fig. 1 0). Geographically, it lies between two low-angle thrust faults: the Mill Spring. to the north, and the Rocky Valley to the south. This structure is cut by numerous high-angle faults, most of which exhibit minor to moderate vertical and/ or horizontal displacement. One exceptional high-angle reverse fault displaces the north flank of the dome downward approximately 100 feet (30 meters). The dome is considered to be of pre-Cambrian age, while the faulting is post-ore and is thought to have occurred during the Appalachian orogeny (Upper Paleozoic). The mine was developed from a rectangular 7 -compartment shaft which was sunk on the north flank of the domal structure to a depth of 936.4 feet (285.4 meters). Production was started in 1955. Output has increased, due to increased mechanization and the addition of the Beaver Creek shaft in 1989, to a point where the current production of crude ore is approximately 4787 tons per day, yielding an annual production in excess of 1. 25 million tons. Mining is generally by selective open stoping involving three stages: slabbing, backstoping, and benching.