Safety catch installation is shown at the Empire Mines, California. Gold was discovered in Grass Valley in 1850. The Empire Mine operated from 1850 to 1956 and was one of the richest and largest mines in the US, producing some 5.8 million ounces of gold. The Mine site was acquired by the State of California in 1975 and turned into a state park.
Rights management statement available at: http://library.mines.edu/digital/rights.html
The export option will allow you to export the current search results of the entered query to a file. Different
formats are available for download. To export the items, click on the button corresponding with the preferred download format.
By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.
To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export.
The amount of items that can be exported at once is similarly restricted as the full export.
After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.