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KULIUTA GOLD-COPPER PROSPECT
Historical exploration of the Kuliuta gold-copper prospect. Nord Resources’ stream sediment, panned concentrate and soil geochemistry defined an area of interest underlying the northwest-trending Kuliuta ridgeline between the Asmin and Woi Rivers. Streams draining this ridge have stream sediments containing up to 4 ppm Au and panned concentrates up to 50 ppm Au. Nord Resources completed a programme of ridge and spur soil geochemistry over the ridgeline. Soil samples ranged up to 2.5 ppm Au, and defined a NW-SE trending zone of over 2 km strike length characterised by anomalous soil geochemistry and similarly trending gold-mineralised veining. Hand trenching completed by Nord Resources on the Central Stockwork Zone was hampered by boulder-fill, thick soil cover and transported cover. However, their work located a brecciated and altered zone with a width of 40 m with consistent and encouraging gold values. Gold values in channel samples ranged from 0.4 to 6.9 g/t and the best intercept was 4.3 m @ 4.1 g/t Au. The mineralisation in the Central Stockwork Zone was associated with weakly to strongly elevated values for copper to 2,450 ppm. Using soil and stream sampling Nord Resources defined another zone of interest (Northern Stockwork Zone) several hundred metres to the NNW of the Central Stockwork Zone. Limited sampling in this area returned up to 7.5 ppm Au in soils, 0.23 ppm Au in stream sediments and 1.3 ppm Au in rock float.
Bulldozer trenching by the KNMJV on the Central and Northern Stockwork Zones defined a 300 m wide NNW trending corridor of stockworking (Fig 3). Trenching established a minimum strike dimension of 2 km for a zone that remains open to the northwest and southeast. Anomalous trench results are summarised in Table 2.
Drilling of the Northern and Central Stockwork Zones was inconclusive. Table 3 summarises results of KNMJV drilling. In reconciling surface trench gold grades with those encountered in drillhole, the Joint Venture concluded that surface enrichment may have occurred. However, there is unequivocal drill evidence that hydrothermal fluids passed at considerable depth though the Kuliuta structure. Approximately 130 vertical metres of the prospect were drill-tested. Good gold grades were intersected to depths of 143 m downhole in DDH NH5 (1 m @ 3.0 g/t Au) and one of the best intersections occurred from 65 m downhole in DDH NH4 (20 m @ 1.48 g/t Au). These grades are comparable with those encountered in surface trenches.
Aerial photo interpretation and stream sampling by Nord Resources indicated that the NNW trending Kuliuta structural zone persists over a 7 km strike. Elsewhere along this structure Nord Resources obtained highest gold values of 8.0 g/t in outcrop, 22.0 g/t in float and 7.0 ppm in soil. High gold in stream sediments (3.7 ppm) and a panned concentrate (50.0 ppm) appear to be associated with a southeast extension of the structure.
PPM’s exploration at the Kuliuta gold-copper prospect. PPM’s exploration at the Kuliuta prospect has included the completion of grid-based soil geochemistry over the Central and Northern Stockwork Zones and their along-strike and lateral extensions. Previous ridge and spur soil sampling provided at best only a partial coverage of what is a large alteration system. Furthermore, trenching by the KNMJV was restricted to a relatively narrow northwest trending zone along the top of the Kuliuta ridge (Fig 3) despite, for example, anomalous (>0.1 ppm) gold results being obtained in nearly all ridge and spur soil samples from Kuliuta ridge downhill to the Asmin River.
A large soil grid with a NNW trending baseline of 3,100 m length and 32 cross-lines of 100 m separation, each of 1,000 m length, has been established over the Kuliuta prospect and its extensions. Soil samples have been collected along cross-lines at 25 m intervals. The grid covers an area of 3.1 km2. Detailed 1:1,000 scale geological mapping has been completed along all streams within and adjacent to the soil grid. KNMJV trenches have been cleaned of regrowth and also mapped at 1:1,000 scale. Trench intervals in which the KNMJV obtained encouraging gold results have been resampled.
Soil and rock geochemistry. The results of soil and rock geochemistry across the Kuliuta grid are summarized in Figs 4 and 5. A large area of elevated anomalous gold in soils (gold > 0.1 g/t Au) measures some 1,400 m and is up to 600 m wide (Fig. 4). Numerous high gold in soil values have been obtained from west of the baseline on Lines 15 and 16 in the La’mau’sing area. Soil gold values of 3.2, 2.6, 2.1, 0.97 and 0.68 g/t Au have been recorded (Fig. 5). Very encouraging trench results from the La’mau’sing area include:
Trench 12: 39 m grading 3.89 g/t Au, including 21m of 6.54 g/t Au, including 3 m of 31.64 g/t Au;
Trench 11: 51 m grading 0.90 g/t Au including 9 m of 1.56g/t Au and 6 m of 2.08 g/t Au;
Trench 4: 33 m grading 0.90 g/t Au, including 6 m grading 1.83g/t Au and 3 m grading 3.05 g/t Au.
Encouraging results were also obtained from Trench 2, 500 m to the SE of La’mau’sing.
Trench 2: 27 m grading 3.58 g/t Au, including 12 m of 7.64 g/t Au, including 3 m of 23.43 g/t Au