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Sorby Hills Joint Venture Project

Pacifico owns 75% of the Sorby Hills Joint Venture Project. Sorby Hills is located 50km from the regional centre of Kununurra. There are existing sealed roads to transport concentrate from site to the facilities at Wyndham Port, a distance of 150km, and established infrastructure allows for fast track production. Our joint venture partner, with a 25% contribution is Henan Yuguang Gold Lead Co. Ltd. Henan Yuguang is China's largest lead smelting enterprise and the largest silver producer in China.

Geology

Regional Geology (Geological Setting)

The onshore Bonaparte Basin is a remote and under-explored mineral province prospective for carbonate-hosted Zn-Pb (Ag) mineralisation.

The Late Palaeozoic rocks (Devonian to Carboniferous, 380 to 320 Ma) of the Bonaparte Basin were deposited on the margin of a rift basin bounded by Precambrian basement. Map 1 below shows the onshore triangular shape of the basin and its opening and deepening to the north. In the south and east, fault reactivation extending from the Halls Creek Orogen controlled its intra-basin geometry.

The Precambrian Pincombe Inlier was an emergent palaeo-high during Late Devonian to Early Carboniferous sedimentation and separates the Burt Range Sub-basin in the east from the Carlton Sub-basin in the west. The early sediment horizons of the Burt Range Sub-basin are referred to as the Cockatoo, Ningbang and Burt Range Formations, which are made up of basal clastic rocks (sandstones) and dolomitized limestone and clastic units, representing a continuation of continental to marine deposition. Within the project area the succession measures a total thickness of about 300 m .

The Bonaparte Basin sediments are the time equivalents to the Lennard Shelf sediments which host the Mississippi Valley-type (MVT) of the Lennard Shelf between Fitzroy Crossing and Halls Creek in Western Australia.

Map 1. Regional Geological Map

sbmkt025 regional geol map

 

Project Geology

The Devonian-Carboniferous sea appears to have been inundating an incised coastline around a pronounced palaeo-high (Pincombe basement, Map 2 below). The oldest sediments include basal clastic rocks with a gravel beds onlapping on the basement inlier to the east.  A thin succession of intertidal, and shallow marine to lagoonal facies is initially deposited within the project area while eastwards, in the Burt Range Sub-basin the basin floor subsided rapidly accumulating in excess of 2 km of marine sediments as indicated by seismic data. The articulated paleao-coast line is well illustrated W of the Norton deposit where an embayment of Devonian strata extends several kilometres SW  over the basement rocks.

Prior to the onset of Carboniferous sedimentation, the marine platfroma  the palaeo-topography effect appears removed and a rapid .  Correlation between down-hole gamma profiles shows a gradual thickening of Carboniferous strata towards the east within the project area.

The mineralisation at Sorby Hills is located in about 10- 20 m of transitional facies between the Knox Siltstone in the hanging wall and the Sorby Dolomite in the footwall and is made up of reworked clasts of Sorby Dolomite. The extensive dolomitization is inferred to be genetically related to the mineralisation and has completely recrystallized the primary calcite-rich rocks, creating porosity estimated to be up to 15% in part of the Sorby Dolomite (Ferguson 1999). A secondary dolomitization event is indicated by coarse dolomite in fracture linings and vughs.

Map 2. Project Area Geological Map

pmykt083v2 sorby tenplan local geol

Environmental Approvals
Pacifico Exploration and Resource Delineation
Drilling Highlights
Major Milestones
Updated Mineral Resource Estimates
Updated Pre-Feasibility Study
Phase I Metallurgical Testwork
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