iThe Mono Drooinos.—These new diggings arcsituated on the eastern slope of the .Sierra Nevada, within a few miles of Mono Lake, and are said to be within the boundaries of Calaveras county. They ure not very extensive, so far as the present discoveries extend, being confined to one or two paying gulches, and embracing a territory about four iniies in extent. Several companies on one of these gulches are reported as doing remarkably well, while others who are w orking there are realizing but small wages. It is said by some of the adventurers who have been there, that it has been demonstrated by r | prospecting that many of the hills also contain the . precious metal. Water, however, is scarce, and can only be obtained in the diggings by means of ditches, which can be dug from there to the adjacent rivers. One small ditch furnishes the supply used by those working the mines at present.The country in which these new diggings are situated is described as a dreary and inhospitable region, destitute of wood, sage brush being the only article of fuel. Granite rock is the principal geological characteristic of the region, and in many places it is pulverized to a fine sand, which is blown around as the sand is from the hills back of San Francisco, llcing situated at a much higher altitude than our own mining region, it is said to be very cold in the vicinity of Mono in winter, and considerable snow falls tnere during that season, which fact will preclude all possibility of working the mines from the commencement of winter until the opening of spring.—Sonora Age.