In 1908 more than two-thirds of the total output was from the low-grade porphyry ores mined at Newhouse, Beaver county, and at Bingham, Salt Lake county.
The total output of the Marne district has for the past three years averaged about 9 million gallons, but it occasionally runs as high as 20 million gallons.
During the first twenty years, and Castelnau estimates the value of the total output down to 1849 at 300,000,000 fr.
The only important region of coal mining in the state up to 1910 was in Carson county, where more than nine-tenths of the total output of the state was mined in 1907 and in 1908.
The geological conditions of the different fields, and the details of the composition of the oils yielded, are exceedingly varied, and their study has been little more than begun In 1859 when the total output of the country is supposed to have been only 2000 barrels of oil, production was confined to Pennsylvania and New York.