Perth, May 27, 2008 AEST (ABN Newswire) - The Directors of Oropa Limited (ASX:ORP) are pleased to announce the completion of an independent JORC Code compliant inferred resource estimate for the Sihayo 1 North deposit, part of the Company's 75% owned Pungkut Gold Project in North Sumatra, Indonesia, of 12.1 million tonnes grading 2.4g/t gold for 910,000 ounces of contained gold - representing a 49% increase in gold resources.
Sihaho 1 North Project:
---------------------------------------------Cut-off Grade Tonnes Grade Contained Gold Millions g/t,Au Millions, ozs--------------------------------------------- +1.0 g/t 12.1 2.4 0.91---------------------------------------------
The resource at Sihayo 1 North remains open along the north western margin, and the Company plans to undertake additional drilling to target possible extensions to the resource. Oropa will also embark upon an infill drilling program to increase resource confidence to at least an Indicated status as preparatory work continues towards a Bankable Feasibility Study.
Combined with the previous Sambung Resource estimate, total Sihayo 1 North/Sambung Inferred Resources now stand at 1.01 million ounces of gold.
Table 1: Oropa Sihayo 1 North and Sambung Resources
------------------------------------------------Project Tonnes(M) Grade Contained Gold g/t gold Million ounces------------------------------------------------Sihayo 1 North 12.1 2.4 0.91(+1.0 g/t cut-off grade)------------------------------------------------Sambung 1.1 2.6 0.10(+1.5 g/t cut-off grade)------------------------------------------------Combined InferredResource 13.2 2.4 1.01------------------------------------------------
Oropa will immediately embark on a Scoping Study for the combined Sihayo 1 North and Sambung deposits, and will engage the services of an independent engineering consultancy group to conduct that study.
The Company also intends to conduct further fieldwork at Hutabargot Julu, located 5.5km southeast of the Sihayo 1 North resource, in the coming months to undertake additional, more intensive drilling at this epithermal vein system after the recent intersection of 5m at 35.67g/t at a depth of 47m from surface. While the planned Scoping Study will focus solely on the Sihayo 1 North and Sambung deposits, it is intended that any future success and resource estimate at Hutabargot Julu would be incorporated into any final mining plan for the area.
Details of independent resource estimates:
Sihayo 1 North - May 2008 ordinary kriged estimation completed by Mining Assets P/L for the purpose of a preliminary scoping study. The estimate is based on data from 81 diamond drill holes spaced 100m by 100m in the northern and central domains and 50m by 50m in the southern domains. Wireframes are based on a nominal cut-off of 2m at 0.5g/t grade and were guided by geological interpretations. Samples were composited to 2.5m and no top cut was applied.
Estimations were completed using Surpac block models with parent blocks 50m (N) by 50m (E) by 5m (RL) and sub-blocked to 12.5m (N), 12.5m (E) and 1.25m (RL). The ordinary kriged estimate was completed in 2 runs: Run 1 parameters - hard boundaries for all objects, 200m search radius for major axis, min samples = 3, max samples = 8; Run 2 parameters - hard boundaries for all objects, 400m search radius for major axis, min samples = 2, max samples = 8. Bulk density for mineralised material was 2.49t/m3.
Sambung - January 2007 ordinary kriged estimation completed by Mining Assets P/L for the purpose of a preliminary scoping study. The estimate is based on data from 74 diamond drill holes with a maximum drill density of 50m (E-W) by 25m (N-S). Wireframes were based on a nominal cut-off of 2m at 0.5g/t grade and were guided by geological interpretations. Samples were composited to 1.0m and top cuts of 8g/t and 15.5g/t applied to the various domains. Estimation was completed using Surpac block models with parent blocks 25m (N) by 50m (E) by 5m (RL) and sub-blocked to 12.5m (N), 25m (E) and 2.5m (RL). The ordinary kriged estimate was completed in a single run using the following parameters: hard boundaries for all objects,150m search radius for major axis, min samples = 5, max samples = 10. Bulk density of mineralised material is 2.5t/m3.
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