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St Barbara Ltd.

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Summary

Project:

Simberi

Deposit:Simberi
Location:Papua New Guinea
Commodities:Gold-Copper
Date:3/2/2020
Report Code:JORC
Report Type:Resource Estimation
Project Stage:Active Mining & Production
Report details:2-3-2020: St Barbara Ltd. announces a Resource Estimation report for its Simberi deposit at the Simberi project. Updated Resource and Reserve statement for Simberi Mine. The previous publicly reported Proved and Probable Ore Reserve Estimate reported at 3
Resources:(Reserves, P+P): 34.3Mt @ 2.0g/t Au
CP/QP:[Resources]: Chris De-Vitry (Manna Hill Geoconsulting)
ABSTRACT:The previous publicly reported Proved and Probable Ore Reserve Estimate reported at 30 June 2019 was 26,086,000 t @ 2.0 g/t Au containing 1,687,000 ounces of gold. This has increased by 486,000 ounces of gold to 34,321,000 t @ 2.0 g/t Au containing 2,173,000 ounces of gold. Simberi Ore Reserves increased after mining depletion, primarily due to increased drill density in Sorowar (converting inferred material to indicated and measured), a higher gold price (US$1,300/oz at 31 December 2019 compared with US$1,250/oz at 30 June 2019) and revised pit designs. The oxide grade dropped from 1.3 g/t Au to 1.2 g/t Au due to a lower cut‐off grade, while the sulphide reserve grade reduced from 2.4 g/t Au to 2.3 g/t Au. A substantial increase in tonnes has resulted in an additional 452,000 gold of gold to the sulphide reserve, largely driven by the increased drilling in Sorowar and cut‐off grade changes. The overall reserve grade has reduced by approximately 0.04 g/t Au (2%) from 30 June 2019 to 31 Dec 2019, to remain at 2.0 g/t Au when displayed to one decimal place.

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