Lassen County California
The Diamond Mountain District and Hayden Hill district produced 147,500 ounces of gold in Lassen County, with a considerable amount of unrecorded placer gold produced before 1880.
At Hayden Hill, in the northcentral part of the county, in townships 36N and 37N. Range 10E and 11E produced 116,000 ounces of lode gold, 1870-1910, from several mines. This burned down in 1910. Six miles south of Susanville, in township 29N. Range 11E and 12E, the Diamond Mountain district had a total production of 10,000 ounces of placer gold and 22,000 ounces of lode gold. In area stream gravels of Tertiary age, you can find placer gold. At the lode mines, there are several areas of gold quartz lode veins in three types of igneous rocks.