File:Mining with steam points.jpg

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    Description
    English: Steam points in place underground in a drift mine in permafrost. The steam thaws the frozen gravel, permitting it to be dug out and washed to recover the gold.
    Date copyright 1909 photo 1908
    Source Through the Yukon and Alaska [1] Mining and Scientific Press, San Francisco, 1909 p213.
    Author T.A. Rickard photographer probably Rickard
    Permission
    (Reusing this file)
    Public domain
    This Canadian work is in the public domain in Canada because its copyright has expired due to one of the following:
    1. It was subject to Crown copyright and was first published more than 50 years ago, or

    it was not subject to Crown copyright, and

    2. it is a photograph that was created prior to January 1, 1949, or
    3. the creator died prior to January 1, 1972.
    You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
     Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.

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    Public domain
    Public domain
    This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1931, and if not then due to lack of notice or renewal. See this page for further explanation.
    United States
    United States
    This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

    Captions

    Using steam to thaw frozen gravel in a gold mine in permafrost

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    data size

    795,059 byte

    height

    1,552 pixel

    width

    2,373 pixel

    media type

    image/jpeg

    checksum

    dc192c85a072762f4fed06727536dfd59d0d9350

    determination method or standard: SHA-1

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    Date/TimeThumbnailDimensionsUserComment
    current21:52, 3 December 2010Thumbnail for version as of 21:52, 3 December 20102,373 × 1,552 (776 KB)wikimediacommons>Dankarl{{Information |Description={{en|1=Steam points in place underground in a drift mine in permafrost. The steam thaws the frozen gravel, permitting it to be dug out and washed to recover the gold.}} |Source=''Through the Yukon and Alaska'' [http://www.archi

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