Sardinia, Italy

Main commodities: Au Ag Cu
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The Furtei high sulphidation epithermal gold deposit is located in southern Sardinia, Italy.
(#Location: 39° 32' 5"N, 8° 58' 36"E).

Furtei is hosted by an Oligocene-Miiocene volcano-sedimentary sequence which includes andesitic porphyry domes and associated block and ash flow tuffs, pyroclastic flows, fall and surge deposits with interlayered epiclastics and sediments.   Within the mineralised area there is also a phreatic and/or phreatomagmatic diatreme breccia.   These rocks are calc-alkaline and date at 23.6 to 25.5 Ma.

Hydrothermal alteration covers an area of over 5 sq. km.   Four types of alteration are observed, namely: i). silicification, ii). advanced argillic, iii). argillic and iv). propylitisation, distributed in a progressive, concentric outward zonation from the mineralisation.   Supergene overprint produced secondary kaolinisation and sulphide oxidation.

Gold mineralisation is associated with silicification and to a lesser extent with the advanced argillic zones.   Mineralisation is mainly contained within vuggy and massive silica which form irregular bodies with a vertical extent of up to 100 m and widths of less than 1, up to 100 m and lengths of 4 to 100 m.   Sulphides occur over vertical intervals of up to 300 m in veins within the vuggy silica bodies.   These sulphides are zoned from pyrite-enargite-luzonite at shallow levels underlain by pyrite-enargite-luzonite-tennantite-tellurides at depths of more than 20 to 50 m.

Reserves in 1997 amounted to 2.15 Mt @ 2.82 g/t Au with by-product silver and copper.

The mine produced 4.2 t of gold between 1996 and 2002 from oxide ore before the resource was depleted. Subsequently the processing plant was converted from an oxide heap leach to a sulphide flotation plant and the first gold bar poured in 2007. However, soon after the holding company was put into liquidation and the mine closed.

For detail consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1997.    
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.

  References & Additional Information
   Selected References:
Lattanzi P  1999 - Epithermal precious metal deposits of Italy-an overview: in    Mineralium Deposita   v34 pp 630-638
Ruggieri G, Lattanzi P, Luxoro S S, Dessi R, Benvenuti M, Tanelli G  1997 - Geology, mineralogy, and fluid inclusion data of the Furtei high-sulfidation Gold deposit, Sardinia, Italy: in    Econ. Geol.   v92 pp 1-19

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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