In the Eastern Taimyr, during regional prospecting and metallogenic studies, the experts of the East Department of the FGBU"VSEGEI" (V.F. Proskurnin, S.A. Grakhanov, E.I. Berzon) for the first time explored a diamond on the Tulai-Kiryaka Upland. In the course of the work, alluvial deposits of the brook Canyon (Fig. 1). In addition to diamond, the concentrate contains of magnetite, ilmenite, chrome spinel, and garnet were detected. Diamond is represented by an aggregate of two laminar octahedra of the first type (according to Yu.L. Orlov). The crystal is transparent, colorless, with splintered shading (Fig. 2).
For the first time, the problem of diamond content in Taimyr was raised by V.S. Sobolev [Sobolev VS, 1937] and G.G. Moor [Moor GG, 1941], which, when studying samples by N.N. Urvantsev, collected in 1929 from intrusive bodies in the upper reaches of the river, Upper Taimyr (Bonato hill), identified alneites or mica kimberlites. Three diamonds were found in the same melilite-bearing kimberlites. In Western Taimyr, A. P. Romanov  identified potentially diamondiferous lamproites. In relative proximity to the Tulai-Kiryak Upland, on Cape Tsvetkov, pyropes, including diamondiferous parageneses, were found in the Carnian horizon [Grakhanov SA, Yadrenkin AV, 2007]. Here, in the underlying sediments, intrusive bodies of fluid-explosive breccias were identified, containing unrolled grains of pyrope, picroilmenite, and chrome spinel [Proskurnin V. F., Gavrish A. V., Petrov O. V. et al., 2017].
The first find of a diamond in Eastern Taimyr testifies to the prospects of the latter for primary and alluvial diamond content.