GRADE AND TONNAGE MODEL OF PLACER PGE-Au

By Donald A. Singer and Norman J Page

DATA REFERENCE Calkins and others, 1978.

COMMENTS All deposits used for the model are from the Urals of USSR. The platinum grade plot suggests three populations. Many of the deposits with grades less then l,000 ppb Pt were probably mined by dredges, whereas the majority of deposits were mined by conventional placering methods. Some of the very high grades may represent reporting errors such as grades for a high-grade portion of a deposit being reported as representative of the total deposit. Probably because of the effects of combining deposits mined by two technologies, tonnage is correlated with platinum grade (r = -0.42) and with gold grade (r = -0.54, n = 23). Platinum grade is correlated with gold grade (r = 0.58, n = 23), with osmium grade (r = 0.89, n = 2l), with iridium grade (r = 0.98, n = l0), and with palladium grade (r = 0.99, n = l3). Osmium grade is correlated with iridium grade (r=0.97, n=9) and with palladium grade (r = 0.89, n = l2). Iridium grade is correlated with palladium grade (r = 0.97, n = 9). Other correlations were not significant with the available number of samples. See figs. 198-200.

Figure 198. Tonnages of placer PGE-Au deposits.

Figure 199. Precious-metal grades of placer PGE-Au deposits. A, Platinum. B, Gold.

Figure 200. Other PGE grades of placer PGE-Au deposits. A, Osmium. B, Iridium. C, Palladium.

DEPOSITS

Name Country

Aleksandrovskii Log URRS

Alexii-Olginsky Log URRS

Anianowsky Lojok URRS

Arkhangelskii Log URRS

Besimianni Log URRS

Bielgorsky Log URRS

Bobrowka River URRS

Bolshaya Choumika R. URRS

Bolshaya Kamenouchka URRS

Bolshaya Ossokina R. URRS

Bolshaya Prostokischenka URRS

Bolshaya Sosnovka URRS

Bolshoi Pokap R. URRS

Bolshoi Sakciam URRS

Boyandinskaia URRS

Ejowka URRS

Gloubokia l URRS

Gloubokia 2 URRS

Illinsky Log URRS

Ivov R. URRS

Jerusalimsky-Priisk URRS

Jourawlik R. URRS

Judinsky-Lojok URRS

Kamenka URRS

Kamenka R. URRS

Kisslaia-Peruonatchainik URRS

Kitlim, Severniy R. URRS

Korobowsky Lojok URRS

Kossia R. URRS

Kossoi-Log URRS

Kossorgskii Log URRS

Krutoi Log URRS

Lobwa R. URRS

Log No. l-Propretschnoi URRS

Log No. 2-Suftlii Bor URRS

Log No. 3-Suftlii Bor URRS

Log No. 6-Suftlii Bor URRS

Log No. 7-Suftlii Bor URRS

Logwinska URRS

Lojok at Bisserskaya URRS

Lojok No. l&2 Omoutnaia URRS

Main Valley of Kisslaia URRS

Malaia Koswa R. URRS

Malaia Prostokischenka URRS

Malaia Sosnowka URRS

Malomalsky-Priisk URRS

Malot Pokap URRS

Martian R. URRS

Melnitschnaia URRS

Molitchowka URRS

Morphine-Log URRS

Niasman R. URRS

Nikolai-Tschoudotworsky URRS

Novoi-Log URRS

Obodranny-Lojok USSR

Panowka URRS

Patchek URRS

Pestchanka R. URRS

Phedinan R.-Triok URRS

Podbornaia URRS

Podmoskowoi-Log URRS

Popowsky-Lojok URRS

Popretschne-Log URRS

Roublewik R. URRS

Sirkov Log URRS

Small unnamed-Weressowy URRS

Solovyevskii Log URRS

Soukhoi Log URRS

Srednia-Prostokischenka URRS

Stepanoff-Log URRS

Syssim R. URRS

Tilai R. URRS

Toura R. URRS

Trudny-Log URRS

Tsauch R. URRS

Tschachewitaia URRS

Tschch R. URRS

Unnamed creek-B. Sosnowka URRS

Verkho-Tourie URRS

Wyssim R. URRS

Yermakof-Log URRS

Zaetzeff, R. URRS

Zemlianoi-Mostik Log URRS