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Trail Ridge, Folkston West, Amelia, Highland |
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Georgia, USA |
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Ti Zr
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Folkston West and Amelia deposits of heavy mineral sands in coastal Georgia, USA, are part of a landform known as Trail Ridge.
Trail Ridge is believed to represent a palaeo marine bar or spit or alternatively a beach ridge. The Trail Ridge extends for some 240 km from south-eastern Georgia into northern Florida and also includes the Highland and Trail Ridge orebodies in the latter State. The deposits are belived to be Pliocene to Pleistocene in age.
At Folkston West the titanium minerals ilmenite, leucoxene and rutile comprise 51% of the total approximately 10 Mt of heavy minerals in the deposit. The deposit extend over an almost continuous length of 30 km in a north-south direction and a width of 800 to 1600 m with higher concentrations (2.5 to 6% HM) in a lower zone which is 2.3 to 5 m thick. The upper surface of this zone of higher grade concentrations is generally 7.5 to 10 m below the surface. Much of the overlying sand is also above the cut-off grade of 1.5% HM. The average of both the high grade zone and the overlying sands averages between 1.5 and 3.5% HM in drill holes quoted. The mineralised sand comprises fine quartz grains, overlying more clay rich finer quartz sands, which in turn rest on lignites.
Amelia to the north of Folkston West occurs in two blocks, the southern most of which covers an area of some 9 km and has a width of around 2400 m (containing 2.3% HM over and average 6.7 m thickness), while the northern is 13 km long and averages 1500 m in width (2.5% HM over a thickness of around 5 m). The two areas contain more than 4 Mt of contained HM, 60% of which are titanium minerals (ilmenite, leucoxene and rutile - with an average 66% TiO2 content) and 13% zircon.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1993.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Pirkle F L, Pirkle E C, Reynolds J G, Pirkle W A, Henry J A, Rice W J 1993 - The Folkston West and Amelia heavy mineral deposits of Trail Ridge, southeastern Georgia: in Econ. Geol. v88 pp 961-971
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