PROSPECTS FOR ALUMINA, GOLD, AND DIAMONDS SEARCHING IN THE CHAPA – TYRADA INTERSTREAM AREA IN THE NORTH OF THE YENISEI RIDGE (KRASNOYARSK TERRITORY)

G. N. Cherkasov

Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

The preliminary study of the Chapa and Tyrada objects of metasomatic (secondary) andalusite-chloritoid quartzite as a source of alumina has revealed that aluminous quartzites are amenable ore containing 31.0 % and 35.2 % aluminous minerals (andalusite, chloritoid, and margarite), respectively. The ores can be surface mined and easily dressed. The explored part of the Chapa object contains 551 mlntonnes of Р2 ore resources. Besides, the quartzites are gold-bearing (0.3–1.0 g/t), and Au resources exceed 250 tonnes. The objects can be granted the status of a complex bulk gold-alumina deposit. A fluidized diatreme was discovered in the Chapa object ore field. To the north, in the Podkamennaya Tunguska River basin, a diamond crystal discovery was associated with such a diatreme. The author suggests surveying the Chapa diatreme for gold and diamonds and searching for similar diatremes in the fields of the Chapa and Tyrada objects.

Keywords: metasomatic quartzites, fluidized diatremes, diamonds, andalusite, chloritoid, gold mineralisation, bulk gold deposits.

DOI 10.20403/2078-0575-2017-6s-119-126