2000 Annual Report - Heron Resources Limited

More documents

Recommendations

Info

Operations Review 2.0 Continued Table 8 - GOONGARRIE SOUTH PROSPECT Diamond Drilling (DD) and Reverse Circulation (RC) Drilling Comparisons, 1.00% Ni Cut-off Hole From To Interval Ni Co Number m m m % % GSDD001 16 28 12 1.54 0.207 GSRC042 18 28 10 1.42 0.113 GSDD002 11 14 3 1.55 0.355 GSRC043 11 23 12 1.53 0.399 GSDD005 28 43 15 1.28 0.129 GSRC198 24 34 10 1.12 0.182 40 42 2 1.10 0.052 GSDD006 27 46 19 1.50 0.034 GSRC035 28 47 19 1.38 0.054 GSDD007 10 29 19 1.38 0.196 34 47 13 1.05 0.064 GSRC036 12 35 23 1.34 0.121 49 57 8 1.16 0.093 GSDD008 35 43 8 1.70 0.700 50 54 4 1.33 0.125 GSRC197 34 43 9 1.64 0.442 49 52 3 1.45 0.086 Table 9 - GOONGARRIE SOUTH PROSPECT Diamond Drilling (DD) and Reverse Circulation (RC) Drilling Comparisons, 1.25% Ni Cut-off Hole From To Interval Ni Co Number m m m % % GSDD001 17 28 11 1.58 0.221 GSRC042 19 28 9 1.46 0.119 GSDD002 12 14 2 1.81 0.404 GSRC043 12 16 4 1.86 0.647 GSDD005 28 34 6 1.41 0.184 39 42 3 1.34 0.060 GSRC198 29 32 3 1.41 0.182 56 59 3 1.39 0.058 GSDD006 27 45 18 1.52 0.033 GSRC035 35 45 10 1.62 0.042 GSDD007 13 29 16 1.43 0.228 34 37 3 1.32 0.048 GSRC036 15 30 15 1.47 0.147 54 57 3 1.30 0.092 GSDD008 35 38 3 2.34 1.520 50 52 2 1.51 0.074 GSRC197 35 43 8 1.72 0.472 50 52 2 1.62 0.087 The drill hole numbers with “GSDD” as a prefix and printed above in bold, denote the Diamond Drill hole results. The underlying row of data with “GSRC” as a prefix is for the adjoining RC drill hole, located some 5m from the Diamond Drill hole collar. Comparing Tables 8 and 9, all ore zones defined by the RC drilling have been replicated by the Confirmation Diamond Drilling. In terms of the large grade variability normally attributed to Nickel Laterite mineralisation, the correlation and validation results for the Goongarrie South ore zones are exceptional. Goongarrie South Metallurgy Half drill core samples were dispatched to the Lakefield Oretest metallurgical laboratory in Perth. A total of 14 half core and 2 RC drill chip geological bulk composites are undergoing metallurgical evaluation. Sample splits were returned to Kalgoorlie for check assay and qualitative screen upgrade testing. Replicate assays have demonstrated excellent precision, confirming a high level of confidence in the analytical programs. Initial metallurgical test work on Limonite Ore indicates an acid consumption of around 200-250kg/t and Ni and Co recoveries exceeding 93%, which is encouraging. A further 4 samples from Goongarrie South were collected by Centaur and submitted for metallurgical study as part of the Cawse Stage II PFS. Metallurgical performance was as expected for Walter Williams Limonite Ore, although final results are not as yet available to Heron. Photo Strip: These ore sample piles were drilled a year ago, during the 800x80m pattern drilling. The sample piles quickly decompose when exposed to the weather. ‘Land of Navajo’ Leith Stevens “My painting represents a birds-eye view of the Navajo mine. The four hills represent the mine.” page 16 Heron Resources NL Annual Report 2000
2.0 Continued Operations Review Goongarrie South Ore Genesis Studies Detailed technical studies, including XRD clay analysis in conjunction with the Geological Survey of WA at Kalgoorlie, are current on Heron’s Diamond Drill core, to elucidate the controls on mineralisation. There are two dominant ore styles. “Limonite Ore” consists of massive non-textured, amorphous clay-goethite occurring in the upper weathering zone of the ultramafic. Typically the ore is yellow-brown, and includes darker coloured horizons containing hydromorphic pyrolusite. The ore style and grades are remarkably uniform. Grades typically exceed 1.1% Ni and 0.1% Co, with the peak grades at the top of the ore zone. From geotechnical logging, the Limonite Ore is expected to be entirely soft and free-digging, with an in-situ bulk density of 1.3 to 1.8. “Siliceous Ore” underlies and is a less leached totally gradational variant from Limonite Ore. It contains massive to vuggy chalcedonic silica, which occurs as cellular stockworks with a dark brown clay infill. There is a sharp visual and grade boundary at the base of the Siliceous Ore, which is recognised by a pronounced increase in MgO to above 10%, accompanied by green clay colours and the appearance of magnesite in vugs and joints. Grades of Siliceous Ore typically exceed 0.75% Ni and 0.07% Co, and with screen upgrading of 30-45%, leach feed grades exceeding 1.1% Ni and 0.1% Co for the life of the project can be achieved. The Siliceous Ore should be initially free-digging in upper zones, but require paddock blasting with increasing depths. The in-situ bulk density similarly increases with depth, from 1.8 to 2.3. Detailed multi-element geochemistry has been completed on the Goongarrie RC drill data base to categorise ore styles: 90 Figure 7 - GOONGARRIE NICKEL PROJECT Differentiation of Limonite Ore and Siliceous Ore SiO 2 (Calc) 80 70 60 50 40 30 20 10 0 Scotia Dam Prospect Siliceous Ore Limonite Ore 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 FeO During 2000, Heron completed 29 RC drill holes at Scotia Dam for 1,330 metres. Significant intercepts include: Table 10 - SCOTIA DAM PROSPECT RC Drilling Significant Intersections, 0.75% Ni Cut-off Hole No. North East From To Interval Ni Co Ni4Co Ni4Co%* m m m m m % % % x m GSRC068 59,203 6,010 14 38 24 1.32 0.239 2.28 54.72 GSRC069 59,200 6,086 11 17 6 1.03 0.178 1.74 10.44 21 48 27 1.27 0.062 1.52 41.04 GSRC076 58,800 6,169 14 35 21 1.39 0.226 2.29 48.09 GSRC090 56,002 7,366 20 35 15 1.03 0.082 1.36 20.40 * ”Ni4Co% x m” for a drill intercept is the value of %Ni plus 4 times %Co of the interval multiplied by the intercept in metres. A nickel sulphide target has been delineated at Scotia Dam. The anomalous interval is 18m at 2,466ppm Ni and 347ppm Cu at the basal contact of the olivine cumulate komatiite sequence. Peak copper is 0.14%. The eastern Scotia Dam prospect area on Siberia Formation ultramafic contains an area of 1.20x0.15km hosting a 20-78ppb Au soil anomaly within a favourable Bardoc Tectonic Zone structural setting. There has been no systematic drill testing of the target. The target zone is close to proposed mullock dump sites for the future Scotia Dam pit, so the gold target will be drill tested in the course of mullock sterilisation drilling. Heron Resources NL Annual Report 2000 page 17
Page 1 and 2: ABN 30 068 263 098
Page 3 and 4: Heron Resources NL Directors Rodney
Page 5 and 6: Heron Resources NL Chairmans Review
Page 7 and 8: 2.0 Continued Operations Review - 1
Page 9 and 10: 2.0 Continued Operations Review STR
Page 11 and 12: 2.0 Continued Operations Review RES
Page 13 and 14: 2.0 Continued Operations Review Fig
Page 15 and 16: 2.0 Continued Operations Review 2.1
Page 17: 2.0 Continued Operations Review Goo
Page 21 and 22: 2.0 Continued Operations Review A g
Page 33 and 34: 2.0 Continued Operations Review At
Page 39 and 40: Statutory Information Heron Resourc
Page 41 and 42: Corporate Profile 3.0 Continued pag
Page 43 and 44: Directors’ Report 4.0 Continued p
Page 45 and 46: Directors’ Report 4.0 Continued p
Page 47 and 48: Heron Resources NL Financial Statem
Page 49 and 50: 5.0 Continued Financial Statements
Page 63 and 64: Heron Resources NL Independent Audi
Page 65 and 66: Shareholder Information 7.0 Continu
Page 67 and 68: 8.0 Continued Interest in Mining Te
Page 69 and 70:
8.0 Continued Interest in Mining Te
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Glossary of Terms Heron Resources N
Page 83 and 84:
Heron Resources NL In the Community
show all

2000 Annual Report - Heron Resources Limited

Create successful ePaper yourself

Delete template?

Save as template?