Mindoro drills one m of 246.41 g/t Au at Kay Tanda
Mindoro Resources Ltd (C:MIO)
Shares Issued 75,470,405
Last Close 7/5/2007 $1.10
Friday July 06 2007 - News Release
Ms. Penny Gould reports
MINDORO RESOURCES LTD.: FINAL RESULTS FROM HIGH GRADE HOLE KTDH-20 AT KAY TANDA
Mindoro Resources Ltd. has provided additional results for two core drill holes from the Kay Tanda epithermal gold-silver prospect, Archangel project, the Philippines. These include final results from KTDH-20, from which a bonanza intercept of one metre of 246.41 grams per tonne (g/t) gold from 25 to 26 metres was reported in Stockwatch on June 15, 2007. Final results for KTDH-20 are 61 metres grading 5.12 g/t gold from three to 64 metres, which includes 11 metres of 25.42 g/t gold from 17 to 28 metres, as well as the bonanza intercept noted above. The bonanza intercept enhances overall grade and will be reduced by cutting in the final resource estimate.
It is anticipated that more similar high-grade zones will be encountered within the large area of mineralization outlined to date at Kay Tanda, where drilling has been mostly on 50-metre by 50-metre centres. Since these zones fall within the area that is already being evaluated for an open pit operation, they will not be pursued by detailed drilling. Their significance is that they indicate a robust mineral system, with potential for high-grade underground mining below the proposed open pit, and that they will raise the average final open pit head grade. High-grade zones encountered below the proposed open pit level will be evaluated in more detail by drilling and underground exploration at a later date. Current focus is on advancing Kay Tanda as an open pit, heap leach operation.
Hole KTDH-19 was a step-out, low-angle hole, on the western part of Kay Tanda. Results included one metre of 643 g/t silver (from 137.5 to 138.5 metres), as well as low-grade gold mineralization deeper in the hole (25 metres of 0.69 g/t gold). Pervasive porphyry-related phyllic and SCC alteration was encountered from 230 metres to hole bottom at 500 metres, with abundant anhydrite, gypsum and quartz veining, with two to 10 per cent pyrite, and minor, but significant quartz-pyrite-chalcopyrite (copper) veining increasing with depth. These porphyry-related alteration and mineralization characteristics are commonly drill intersected at deeper levels over broad areas at Kay Tanda. Drill targets for drill testing of porphyry potential will be selected once surface evaluation of the entire six kilometre mineralization trend at Archangel has been completed.
Summary of latest results
The table summarizes results of the latest drilling (based on a cut-off grade of 0.3 g/t gold).
Sample
From To length (m) Au g/t Ag g/t
KTDH 19 137.50 138.50 1.00 0.50 643.10
141.00 142.00 1.00 0.49 9.65
220.00 245.00 25.00 0.69 0.63
Including 231.00 235.00 4.00 1.04 1.10
269.00 270.00 1.00 0.49 0.50
294.50 297.50 3.00 0.53 N/R
304.00 305.00 1.00 0.44 N/R
312.75 314.00 1.25 1.81 N/R
KTDH 20 3.00 64.00 61.00 5.12 0.98
Including 17.00 18.00 1.00 12.92 0.50
Including 25.00 26.00 1.00 246.41 2.15
72.00 73.00 1.00 0.44 0.50
83.00 106.00 23.00 0.50 0.61
N/R: not yet received
About Kay Tanda
Epithermal gold-silver mineralization at Kay Tanda is associated with extensive and intense quartz stockworks, veins and hydrothermal breccias, with accompanying base metal sulphides. Kay Tanda is reflected by an induced polarization chargeability anomaly that is about 1.5 kilometres by 1.4 kilometres in extent, which is part of a much larger chargeability anomaly which extends over six kilometres along strike to the northeast. To date, drilling has been conducted only on the Kay Tanda part of the trend.
Mindoro has completed over 150 reverse circulation (RC) and 20 core drill holes at Kay Tanda. Almost all holes have encountered near-surface, generally flat-lying to gently dipping blanket-like low-grade stockwork mineralization. This is strongly to partially oxidized to depths of 40 to 160 metres and non-oxide below this. Drilling, especially at deeper levels, has encountered at least five steeply dipping, much higher grade zones with bonanza grades to 246 g/t gold and over 1,000 g/t silver, which are interpreted as structurally controlled upflow, or "feeder" zones. Further drilling and structural studies are in progress to determine the nature and controls of the high-grade zones. The high-grade mineralization appears to occur preferentially at elevations below 150 metres (ASL) within a boiling zone. Few holes have penetrated to this depth to date. Such upflow zones can be associated with bonanza mineralization and constitute some of the world's best epithermal gold-silver deposits.
At a cut-off of 0.3 gram per tonne (g/t) gold, the immediate exploration target is from 35 million to 40 million tonnes of open pittable material at a grade of 0.76 to 0.80 g/t gold and 2.4 to 2.8 g/t silver, containing between 860,000 and one million ounces of gold and 2.7 million to 3.6 million ounces of silver. This exploration target may be revised upward at a later date as extension drilling continues with two diamond drill rigs at Kay Tanda. At a cut-off of 0.5 g/t gold, the immediate exploration target is from 15 million to 20 million tonnes of open pittable material at a grade of 1.1 to 1.4 g/t gold and 3.0 to 3.4 g/t silver, containing from 530,000 to 900,000 ounces of gold and from 1.45 million to 2.2 million ounces of silver.
Kay Tanda is being evaluated for its open pit, heap leach potential. Initial metallurgical testwork has produced excellent results. Kay Tanda is interpreted as intermediate to low sulphidation epithermal quartz-carbonate-gold-silver-base-metal mineralization telescoped into the top of an underlying porphyry copper-gold system.
Programs are carried out under the supervision of Tony Climie, PGeol, who is a qualified person as defined by National Instrument 43-101. Sample preparation and assaying are performed by McPhar Laboratory of Manila, an ISO 9001/2000 accredited laboratory. Gold assays were by 50-gram fire assay fusion; where gold assays greater than three parts per million (ppm) were by gravimetric finish, and by AAS where the gold values were less than that threshold. Silver was determined by AAS after an HCl-HNO3-HClO4 digest. Normal quality control and quality assurance procedures are being carried out, using a system of duplicate, standard and blank samples.
© 2007 Canjex Publishing Ltd.
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