Deposit Synonyms

4 Mile; Alliance Resources; Beverley West; Four Mile; Ml 6402; Quasar Resources

Mineral District

Deposit Summary

roll front style U. Mineralisation in fluviatile sand of the Eocene Eyre Formation. Inferred resource 3.9Mt at 0.37% U3O8 (15 000t U3O8). production to end 2014 620 tonne UOC.

Deposit Description

FOUR MILE EAST, discovered in April 2005 during exploration drilling on the plains west of the Beverley Uranium Mine. Data available indicates that deposits are comprised of a series of multiple stacked roll fronts within permeable sands of the Eyre Formation and the Four Mile basal diamictite. Roll fronts are often separated by thin, <0.5m thick), clays. Initial drilling identified separate western (Four Mile West, see mindep # 11613) and eastern (Four Mile East) mineralised zones about 3 km apart, the mineralisation being hosted by Tertiary sediment overlying weathered Proterozoic basement. Four Mile Creek, an exclusion zone (on Aboriginal heritage grounds) separates the 2 zones. Drilling confirmed a generally shallow depth to basement (60-70m) closer to the adjacent Flinders Ranges to the west, and defined the margins of a fault-bound topographic depression in which carbonaceous clay, silt and sand of the Eyre Formation was deposited. Both East and West mineralised zones appear to have been significant controlled by basement faulting. Further resource drilling at Four Mile East indicates 4 upwardly fining stratigraphic units 2-10 m thick. The mineralisation is generally between 200-210 m in depth, variable from 1-8 m thick. Mineralisation occurs in both coarse, and fine-grained layers of each unit. Average grades are typically >0.1% pU3O8, and more commonly ~0.3% U3O8, with values >1% intersected. Further intercepts of mineralisation of similar depth and grade are identified in drill holes ~1.2km to the NE of Four Mile East. 2016 updated PEPR (see reference Cno. 2039234) states resource figures for contained U3O8, and at cut off of 0.5 m%U3O8, of 12 Mlb (5,443 tonne) for Four Mile E, 14,061 tonne for Four Mile NE (with 26 Mlb currently quarantined and not included in the total), 14,061 tonne for Four Mile W below the water table, and 12,701 tonne for four Mile W above the water table (also not included currently in recoverable ore). Estimate for total recoverable resource is therefore FME + FMNE + FMW (below WT) = 74 Mlb or 33,566 tonne U3O8. Production commenced in late June 2014, with production to end 2014 of 1,1664,299 Ib (620 tonne) UOC (uranium ore concentrate) (see alliance resources ASX release 31/12/2014).

Discovery Year

? 2005

Commodities

Uranium, Uranium Oxide

Ore Minerals

Uranium Minerals (Non Specific)

Gangue Minerals

? Frome Embayment

basement faulting with development of fault-bound topographic depression in which carbonaceous clay, silt and sand of the Eyre Formation was deposited.