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Grafton-Maclean Metallogenic Map Explanatory Notes (2001)

Geological Survey of New South Wales
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The Grafton-Maclean 1:250 000 map sheet area is the most mineralised map sheet area in the New England region with a wide range of commodity and deposit types. Major commodities include tin, tungsten, molybdenum, gold, arsenic, chromium, asbestos and topaz. Types of mineralisation present in the area include: - hydrothermal granite-related pipes, veins, multiveins, sheeted veins, stockworks, greisens and disseminations; - metahydrothermal gold, antimony and mercury; - ophiolite-related chromium and asbestos; - skarn occurrences; and - alluvial, eluvial and deep lead tin, alluvial gold and sapphires and heavy mineral sands. This metallogenic study forms the basis for renewed minerals exploration in the region. Mineralisation associated with granites, especially leucocratic granites, is a particularly attractive exploration target. Data collected during this study indicate that there is a particularly high potential for polymetallic mineralisation associated with buried granitoid bodies. High-resolution geophysics, together with the data presented in these Notes, would indicate areas amenable for further intensive exploration. Mineralisation offering the greatest exploration potential includes: - disseminated gold associated with Early Triassic leucogranites; - metahydrothemal gold; - alluvial and deep lead tin in the Emmaville'Mole Granite area; - large-tonnage/low-grade hard-rock tin (Taronga type); - large-tonnage/low-grade deposits of tin, tungsten, molybdenum (Glen Eden type); - base metals associated with granitoids (Cangai copper type); - base metals associated with the Drake Volcanics; - emeralds associated with the Mole Granite; - silexite; - alluvial sapphire; and - gas and petroleum associated with the Clarence- Moreton Basin and related rocks.


Henley H F, Brown R E, Brownlow J W, Barnes R G, Stroud W J, Facer R. (ed). 2001. 1:250000 Grafton Maclean Metallogenic Map. Metallogenic Study and Mineral Deposit Data Sheets. Geological Survey of New South Wales.