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Dalmatovskoye, Dalmatovskoe, Dalur, Khokhlovskoye, Dobrovolskoye |
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Siberia, Russia |
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U
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The uranium deposits of the Dalmatovskoye in situ leach operation and Dalur mine are located 80 km east of Chelyabinsk and 300 km north of Dobrovolskoye in the Zauralsk district of the Kurgan region, Transurals, Western Siberia, Russia.
Dalmatovskoye is the largest of the known deposits, which also include Khokhlovskoye 80 km to the south of Dalmatovkoye, and Dobrovolnoye.
Mineralisation occurs as basal channel sandstone deposits incised into basement rocks or older sediments within a plain. The mineralisation is found below cover at a depth of 450 to 600 m below the present surface.
The host platform-alluvial sediment filled palaeo-channels are 1 to 5 km in width, filled with 30 to 120 m of permeable sediments of Upper Jurassic to Lower Cretaceous and Paleogene to Neogene age. The productive units are alternating sands, gravels, clays and siltstones incised into a Palaeozoic volcanic basement, with uranium mineralisation concentrated at redox fronts.
The main Dalmatovskoye deposit occurs as a number of orebodies at a depth of 360 to 500 m in a main 11 km long channel and an 8 km tributary palaeo-valley, both of which are around 1.5 km in width. Individual orebodies are 400 to 4500 m in length, 50 to 700 m wide and 2 to 12 m thick, with the mineralised roll-fronts being up to 20 m thick. The host channel facies are Middle- to Upper-Jurassic yellow oxidised and grey reduced sandy gravel, sandstone and conglomerate, interbedded with silty mudstone.
The uranium ore at Dalmatovkoye occurs as coffinite and uraninite (pitchblende) with grades of from 0.01 to 3% U3O8, and associated Sc, Re, Mo and REE minerals. The higher grade mineralisation is controlled by redox boundaries in the sand-gravel aquifers with a lenticular- or roll-shape elongated along the valley axes. In cross-section, the ore occurs as single or stacked lenses in several permeable units separated by argillaceous facies (IAEA, 2002).
The reserves at the Dalmatovkoye and Dobrovolskoye deposits have been quoted at 10 000 t U at average grades of 0.04% U. Probable resources have been estimated as 80 000 t U (IAEA, 2002).
The most recent source geological information used to prepare this decription was dated: 2007.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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