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The mineral now known as Gilsonite or Asphaltum was discovered in the early 1860’s, but it was not until the mid-1880’s that Samuel H. Gilson began to promote it as a waterproof coating for wooden pilings, as an insulation for wire cable, and as a unique varnish. Gilson’s promotion of the ore was so successful that, in 1888, he and a partner formed the first company to mine and market Gilsonite on a commercial scale. Originally, Gilsonite was sold as “Selects” and “Fines”; the low softening point ore with conchoidal fracture was known as “Selects”.
seline;="" word-wrap:="" break-word;="" color:="" rgb(116,="" 116,="" 116);="" text-indent:="" 0px;"="">The higher softening point ore with a pencillated structure was known as “Fines”. Selects commanded a higher price than Fines because of its better purity, good solubility, and usefulness in the paint, stain, and varnish industries. Time and technology have changed this classification system.
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