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Map of the Sierra Queen Mine, Nevada City, California, 1905

This detailed 1905 map, drawn by Edward C. Uren, a civil engineer, depicts the Sierra Queen Mine located in Nevada City, California. The map provides a comprehensive overview of the mine's layout, including various levels, shafts, and surrounding geographical features. A key feature of the map is the meticulous delineation of the mine's underground workings, represented by colored lines indicating the 70, 200, 300, and 400-foot levels of the mine. The prominent vertical and horizontal shafts, such as the Sierra and Cobden shafts, are clearly marked, showing their connections and extensions within the mine. The map also includes a cross-sectional view of the Sierra Queen Shaft, illustrating its descent through the granodiorite rock, offering insight into the mine's geological context.

A distinctive compass rose, prominently displayed, assists in orienting the viewer to the mine's layout relative to geographic directions. Adjacent to the mine workings is Deer Creek, which runs parallel to the mine, indicating the potential water source or geographic boundary. The presence of the mill and hoist further emphasizes the operational aspects of the Sierra Queen Mine, showcasing the infrastructure supporting the mining operations.

Edward C. Uren, a notable figure in California's mining industry during the early 20th century, not only owned the Lightner Mine in Calaveras County but also served as Superintendent of the Republican and Eagle-Shawmut Mines in Tuolumne County. His expertise and influence extended beyond direct mining operations, as he was also the father of Lester Charles Uren, a pioneer in Petroleum Engineering education at the University of California, Berkeley.

The Sierra Queen Mine map exemplifies the detailed cartographic work required for effective mine management and planning in the early 1900s, reflecting Uren's technical proficiency and deep involvement in the mining sector. This map not only serves as a historical document of the Sierra Queen Mine's operations but also as a testament to Uren's contributions to California's mining heritage.