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The mineral resource potential of the Mount Massive Wilderness in Lake County, Colo., was evaluated in 1983-85. The wilderness consists of about 26,140 acres (40 square miles) of high, mountainous, rugged terrain along the eastern side of the Continental Divide in the northern part of the San Isabel National Forest. No mineral resources were identified within the wilderness, although resources were identified in adjacent mining districts on the south and northeast. A moderate mineral resource potential for stockwork deposits of molybdenum was assigned to a small area in the northeast part of the wilderness. The southwest part of the wilderness has a high mineral resource potential for gold, silver, lead, and zinc in small deposits in veins, and a small part of this area along Halfmoon Creek has a moderate potential for molybdenum associated with the Halfmoon Creek stock. Character and Setting The Mount Massive Wilderness is in the Sawatch Range of central Colorado, about 100 air miles west of Denver and 7 mi (miles) west of Leadville, Colo. (fig. 1). It is bounded on the west for 14 mi by the Continental Divide and on the east by the Arkansas River valley. The wilderness was named after Mount Massive (elevation 14,421 feet), the second highest peak in Colorado. Mount Massive is near the center of the wilderness. Many peaks in the wilderness rise above 13,000 ft (feet); some are 4,000-5,000 ft above the floor of the adjacent Arkansas River valley. The terrain shows evidence of past glacial activity: most peaks are surrounded Manuscript approved for publication May 10, 1989. by cirques, the valleys are U-shaped, and the lower slopes are extensively mantled by glacial debris. Access into the wilderness is provided by many wellmaintained and clearly marked hiking trails. The trailheads can be reached by U.S. Forest Service roads. Road 105 accesses the northern part of the wilderness, and Road 110 follows the southern boundary (fig. 1). State Highway 82, which crosses Independence Pass, provides access to the southwestern part. Spectacular scenery, many lakes, and abundant wildlife make the wilderness a popular summer recreational area. Some of the trails are marked for use during the winter months by cross-country skiers. Precambrian crystalline rocks are exposed throughout the Mount Massive Wilderness. These basement rocks were elevated during a period of mountain building known as the Laramide orogeny, which began in this region about 72 Ma (millions of years ago) with the arching of the Sawatch Range anticline, a very large structure that extends many tens of miles to the north and south. Younger sedimentary rocks that overlay the crystalline rocks before the arching began have been eroded from this area; remnants of them are exposed on the west flank of the anticline near Aspen, some 15 mi west of the wilderness, and in the Mosquito Range (fig. 1), which was originally the east flank of the Sawatch Range. The east flank was broken in the Miocene, about 25 Ma, when a long, narrow block was dropped between northtrending faults to form the Arkansas valley graben, the northernmost graben of the Rio Grande rift system. The graben became the upper Arkansas River valley, which now separates the Sawatch Range from the Mosquito Range. Block faulting has continued along the edges of the graben; small fault movements in the last 10,000 years have broken glacial deposits at the eastern front of the Sawatch Range. Modifications of this terrain by glacial and fluvial activity account for the physiography of the wilderness as seen

Mineral resource potential of Mount Massive Wilderness, Lake County, Colorado