Naturally in such a young and growing field there is tremendous diversity of opinion as to the relative advantage and value of the different methods in the practice and design of the machines and their parts. It is estimated that over $5,000,000 is invested in the business of dredging in the three districts of Oroville, Yuba, and Folsom, and the combined producing capacity in these three districts is estimated at an annual output of about 30,000,000 cubic yards. Today there are fifty, either in operation or building in the districts of Oroville, Yuba, and Folsom, and it is probable that in no single instance is money being lost, while many of the dredges are clearing net profits of from $2000 to $5000 per month. Ten years ago there were no dredges working in California. Probably no branch of mining has come so prominently to the front in so short a time by proving its commercial value it has opened to the financier an opportunity for safe and large investments. Gold dredging has won an important place in the industry of mining, and it has done so by right of hard-earned merit.
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