some more info

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sculpin

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some more info

posted on Apr 12, 2011 07:07PM

Here are a couple more pieces of info to deal with the gold grades around us. I notice in the technical report that Paul Gray assigns an estimated value of 4-5 g/t for the Chorunga Complex. I made a post a few weeks back where I showed the average head grade well over an ounce per ton for the Chorunga, if I remember correctly. So maybe, Pauls numbers in the report are very conservative, even for the other proximity properties mentioned here.

Its interesting to see some info on the vein at Caravelli in the report. I beleive Hog and I saw this area on Google Earth while surfing one night. I beleive we should look at this info in the report a little closer and see if we can draw any new correlations to the Tesoro.

Here is the info;

Paul D. Gray Geological Consultants

Report 10-103

Escobar and Mendoza (1994) comment that the San Juan de Chorunga vein in the Ocoña area has

been worked intermittently since colonial times and continuously since 1970, processing 400 to

600 tonnes per day of mineralized vein material grading 4 to 5 grams per tonne gold. From this

information, it can be calculated that the Ocoña Mine has produced a minimum of 650,000

ounces of gold between 1970 and 1994. Considering that the mine was active for some years after

1994, and that no credit is assigned for gold production in colonial times, the actual production is

probably closer to a million ounces.

Montoya et al (1994) briefly discuss the Huarangillo Mine (location not certain). This is a 250-mlong,

1.25-m-wide quartz vein from which Minero Peru produced 800 kg (55,000 ounces) of gold

between 1940 and 1952.

Valdivia (1991) discusses the Ishihuinca quartz vein near the pueblo of Caraveli. This vein is

reported to have produced about 110,000 ounces of gold from mineralized vein material grading

12 to 15 g/t Au. The principle producing vein is 150 meters long and 1.2 to 10.0 meters wide.

Valdivia notes that gold grade improves below an altitude of 2100 meters ASL, and gives

arguments supporting an assumed resource of one million tonnes grading more than 10 g/t gold

(minimum 320,000 ounces).

Park (2003), in an internal report for Compania Minera Colorado, discusses the Eureka Project

near Chaparra , which is currently producing at a small scale of about 5 tonnes per day. Based on

underground development of seven veins, he estimates an inferred resource of 3.6 million tonnes

grading 14 to 16 ppm gold.

In summary, a review of available literature on the Nazca-Ocoña Gold Belt suggests that goldbearing

veins are generally intrusive-hosted, medium to high grade (5-15 g/t) with bonanza zones

(>1.0 oz/t), generally steep dipping, long (>1.0 km), deep (0.4 to 1.0 km), narrow (20-50 cm) and

locally discontinuous. The information also suggests that veins are pinch-swell structures within

which high grade shoots can exist within halos of low-grade to medium-grade material. There is a

paucity of information concerning the proportion of higher-grade and lower-grade material within