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Thursday, January 20, 2011
Gold Occurrences in Rhode Island
Gold occurrences in Rhode Island are not the subject of many reports, however there is the story of the Durfee Hill Gold Mine in Glocester, Rhode Island where there are reports of the remains of a stamping mill and cyanide vats on the site. There are also some mine shafts that are sunk into the ground nearby. There are no apparent reports of gold in quartz veins. There are however, reports of gold with pyrite in the quartz veins. The reports of the latter is from KentCounty, to the west of Warwick.
Gold bearing pyrite crystals in quartz.
Photo by Rob Lavinsky
Gold that occurs in Rhode Island in three different types of deposits:
One type of gold is found in veins of hydrothermal deposits where the gold often occurs as the native metal in quartz veins.
The second type of gold is often found in his placer deposits in sand and gravel on the beds of streams or on beaches fronting on the ocean. Gold is often panned from this type of deposits by taking advantage of its great density in relation to other minerals. Gold is 19.3 times as dense as water and most of the minerals that occurs with our only three times as dense as water. Placer gold can be found in virtually any stream or river in the world in quantities large enough to see what it looks like.
Gold in quartz.
Photo by Rob Lavinsky
In a 1927 issue of the American Mineralogist by Lloyd Fisher and Charles G. Doll of BrownUniversity in volume 12, pages 427 to 436 you can find a listing of the different minerals that are found in the state of Rhode Island.
This is what they said about the area around Durfee Hill, “Glocester (Durfee Hill) epidote, molybdenite, pyrite and phyrottite are present.
The third type of deposits are found in generally associated with pyrite and other metal sulfides where the gold actually appears as a thin film between the crystals of sulfide.
Another area where gold was then reported in the past is around Johnstown where there are also some old mine workings were a dibase dike cuts across the granites and schists. This is another area that still has old cyanide vats and sluice boxes. When the local chemists reports that the locality has shown a trace of platinum group metals in the mine tailings.
Finally there has been Gold reported at the oldSouthFoster gold mine locality where gold was produced mainly from pyriteferous quartz veins. There are said to be still visible at this locality four open pits that are now filled with water along with the ruins of a large stamp mill.
One of the areas in Newport,Rhode Island, Purgatory Cliffs, has attracted the attention of the author because the cliffs are made out of a quartz pebble conglomerate with crystals of magnetite in the binding material between the pebbles. There is often an association between gold and magnetite. Another area is found in the black sands of the beaches in southern Rhode Island west of Narragansett Bay.
Although these last places are strictly speculative the geology is right for finding gold, and as far as that goes the entire set of rocks along the western side of Rhode Island where borders with Connecticut is another area that geologically is a good place to search for gold especially in placer deposits in the streambeds of the area.