The Tertiary intrusives of Central Colorado have interested geologists and prospectors since the early mining days in this region when it was found that quartz veins and copper carbonate ores were commonly associated with the igneous rocks. A relationship between the ore deposits and the intrusives was recognized in various districts but it was not until Crawford's excellent paper in 19241 that an attempt was made to trace the mineralizing igneous rocks in all of the surrounding districts to a common source in the large Tertiary massive—the Princeton batholith.

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