Morro Velho mine (incl. Mina Velha; Mina Grande), Nova Lima, Iron Quadrangle, Minas Gerais, Brazil

    The oldest continuously producing gold mine is in the Morro Velho Mine in Brazil. It has been in operation since 1725. In the 1930's, the Mina Grande workings reached a depth of 2,453 meters - over one and a half miles below surface. By 1960, the mine had produced some 450 tons of Gold. The mineralogy of the deposit is unusually complex and besides Gold, there are thirty other minerals known. Several, including the Siderite and Fluorapatite seen here are world class in their perfection. This combination specimen features light pink Fluorapatite crystals up to 1.75 inches (4.5 cm) across, with glassy luster and tabular form, surmounted by unusually sharp and large (up to 2.5 inches - 6.1cm) rhombs of Siderite. An interesting aspect, unmentioned by previous owners or any literature that we could find, is that depending on the type of illumination, the Siderite shows a slight but definite color change from olive green under incandescent light, to a warm, orange brown hue under the strobe lighting used for photography. Optical effects aside, this is a beautiful and large group in excellent condition.
    Overall measurements: 7 x 6 x 5 inches (17.8 x 15.2 x 12.7 cm).

    Provenance: Williams Minerals [Hoppel # D0606]

    Condition Report*:

    Condition report available upon request.

    *Heritage Auctions strives to provide as much information as possible but encourages in-person inspection by bidders. Statements regarding the condition of objects are only for general guidance and should not be relied upon as complete statements of fact, and do not constitute a representation, warranty or assumption of liability by Heritage. Please note that we do not de-frame lots estimated at $1,000 or less and may not be able to provide additional details for lots valued under $500. All lots are sold "AS IS" under the Terms & Conditions of Auction.

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    Auction Info

    Auction Dates
    October, 2013
    19th-20th Saturday-Sunday
    Bids + Registered Phone Bidders: 1
    Lot Tracking Activity: N/A
    Page Views: 564

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