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placer mining

placer mining

placer mining Sentence Examples

  • The term 1 is not limited to underground operations, but includes also surface excavations, as in placer mining and open-air workings of coal and ore deposits by methods similar to quarrying, and boring operations for oil, natural gas or brine.

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  • Helena was established as a placer mining camp in 1864 upon the discovery of gold in Last Chance Gulch.

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  • it is almost wholly in the form of snow; and this snow, melting in summer, is of immense importance to the state, supplying water once for placer mining and now for irrigation.

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  • part of Oregon in 1852, and placer-mining was prosecuted here without interruption until 1860, when the metal was found in larger quantities on the streams in Baker and Grant counties in the north-eastern part of the state.

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  • Quartz-mining has since very largely taken the place of placer-mining, but the two principal gold-producing districts are still that traversed by the Blue Mountains in the northeastern quarter and that drained by the Rogue river in the southwestern corner, a continuation of the California field.

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  • The term 1 is not limited to underground operations, but includes also surface excavations, as in placer mining and open-air workings of coal and ore deposits by methods similar to quarrying, and boring operations for oil, natural gas or brine.

    0
    0
  • Helena was established as a placer mining camp in 1864 upon the discovery of gold in Last Chance Gulch.

    0
    0
  • it is almost wholly in the form of snow; and this snow, melting in summer, is of immense importance to the state, supplying water once for placer mining and now for irrigation.

    0
    0
  • part of Oregon in 1852, and placer-mining was prosecuted here without interruption until 1860, when the metal was found in larger quantities on the streams in Baker and Grant counties in the north-eastern part of the state.

    0
    0
  • Quartz-mining has since very largely taken the place of placer-mining, but the two principal gold-producing districts are still that traversed by the Blue Mountains in the northeastern quarter and that drained by the Rogue river in the southwestern corner, a continuation of the California field.

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    0
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