June 04, 2009 15:27 ET

Inter-Rock Nevada Mineral Property Update

TORONTO, ONTARIO--(Marketwire - June 4, 2009) -

Sentinel Project

Inter-Rock Minerals Inc. (TSX VENTURE:IRO) ("Inter-Rock") announced in November, 2008 that it had completed a soil sampling program at its mineral property in Humboldt County, Nevada. The Sentinel property is located in northern Humboldt County, Nevada approximately 80 miles northwest of Winnemucca. Inter-Rock holds 22 claims covering 440 acres. No royalties or lease payments are associated with the property.

Australian Ores and Minerals (AOM) discovered gold mineralization at Sentinel in the 1990's by follow-up field examination of Geoscan Mk. II airborne multispectral scanner anomaly. Their work comprised geological mapping, a closed space soil geochemical program, analysis of rock chip, trench, and road cut samples, and ground geophysical studies. Approximately 984 soil samples on 100 foot grid spacing and 1,160 rock chip samples in the area were collected and analyzed. The rock chip geochemistry returned gold to 7.0 ppm, silver to 39 ppm, arsenic to 690 ppm, and mercury to 9.7 ppm. The soil samples showed gold up to 2.1 ppm with large areas of plus 100 ppb. One trench reportedly revealed a zone of 90 feet grading 1.2 ppm gold.

Mapping and interpretation by AOM suggests that the Sentinel gold prospect occurs in and around a Cretaceous biotite granodiorite stock that has intruded a series of Permian metavolcanics and metasediments. The stock is several thousand feet long. The stock and country rock were later intruded by latite porphyry dikes. NE-SW and NW-SE shear structures with cross cutting faults are also present in the stock. The Permian rocks are locally hornfelsed and pyrrhotized adjacent to the biotite granodiorite and latite porphyry intrusive bodies.

Both the intrusive and sediment/volcanic package contain numerous areas of cross-cutting veinlets, stockworks, and veins of silica, calcite, and iron oxides. Hydrothermal alteration is prevalent throughout the anomalous spectral feature with phyllic/argillic alteration up to 50% quartz and 50% sericite. The alteration and mineralization are indicative of a moderate depth hydrothermal system.

In late 2008, Inter-Rock completed a soil sampling program at the Sentinel property. A total of 230 samples were gathered on a 100 foot grid at both the northern section of the property and at the southern boundary of a previously outlined anomalous gold zone. The Inter-Rock soil sampling program confirmed the presence of three anomalous (greater than 30 ppb Au) zones, where a gold anomaly was defined as a zone containing several contiguous samples containing greater than 30 ppb gold. All three zones had been identified as anomalous gold zones by AOM in their previous sampling program.

Anomaly #1 occurs in the northwest of the property and coincides with the interpreted contact zone between the biotite granodiorite stock and the Permian volcanic series. It measures approximately 500 feet by 700 feet. Gold values in soils are greater than 30 ppb with a central zone greater than 50 ppb and a peak value of 163 ppb. Most of the samples in this anomaly had mercury values greater than 10 ppb; the peak value was 24 ppb. Arsenic is present at greater than 40 ppb over the entire anomaly, with over half of the anomaly greater than 320 ppb, and a peak value of 567 ppb. Silver was greater than 0.3 ppm over most of the anomaly, with a peak value of 5.0 ppm. The highest grade fifteen-foot channel sample results from two trenches and one roadcut within this area were 0.138, 0.104, and 0.058 oz Au/ton respectively.

Anomaly #2 occurs in the north-central part of the property and coincides with the latite porphyry dikes. This zone measures about 400 feet by 600 feet. Gold values in soil are greater than 30 ppb with a central zone of about 100 feet by 100 feet with values greater than 100 ppb; the peak value is 295 ppb. Mercury values range from background levels to greater than 20 ppb. Arsenic is also anomalous, with values greater than 40 ppm, but the arsenic anomaly is about 300 feet to the west of the main gold anomaly. Silver is present in anomalous concentrations over most of the zone, with typical values around 0.3 ppm and a peak value of 4.3 ppm.

Anomaly #3 is in the southern part of the property in an area that is not as well mapped as the northern part. It appears to be within the biotite granodiorite stock or close to its contact with the Permian metavolcanic/metasedimentary unit. The anomaly is approximately 300 feet by 200 feet. Soil gold values are greater than 30 ppb with a peak value of 100 ppb. Mercury is greater than 10 ppb, with peak values of 21 ppb. Arsenic is not as prevalent as in anomalies #1 and #2, with typical values around 10 ppm. Silver is present at around 0.2 ppm, with a peak value of 0.5 ppm. The highest bedrock gold value on the property encountered to date is a 15-foot trench channel sample located in this zone that ran 0.205 oz Au/ton.

All soil samples in Inter-Rock's program were collected from the B horizon. The samples were analyzed by BSI Inspectorate, an ISO9001 certified lab located in Sparks, NV. The analyses were performed using fire assaying with aa finish for Au, cold vapor/aa for Hg, and aqua regia digestion followed by aa analysis for Ag, As, Cu, Pb, Sb, and Zn.

Planning for a first phase reverse circulation drilling exploration program is in progress and will be followed by permit application.

To date, there has been insufficient exploration to define a mineral resource and Inter-Rock cautions that there is a risk that further exploration will not result in the delineation of a resource.

Stingaree Valley Project

Inter-Rock drilled a three-hole, reverse circulation program at the Stingaree Valley Property, located about 45 miles East of Fallon, NV, during February 2009. The drill holes were sited to test three different geophysical targets identified in recent surveys conducted for Inter-Rock by Zonge Geosciences Inc., of Sparks, Nevada and in earlier surveys conducted by others, and to verify a significant grade Au assay reported from an older hole drilled by J.R. Simplot Company. The geophysical anomalies were well explained by the drilling results and a thin Ag-Pb vein was intersected in one of the holes, but only one Au intercept (20 ppb) was encountered in the program. All analyses were performed by BSI-Inspectorate, an ISO9001-certified lab located in Sparks, NV. Au was determined by fire/aa finish, Ag by fire/gravity, and other elements by MS/ICP. Following the receipt of check assay results confirming the original results, the decision has been made not to renew the property lease.

Douglas H. McGibbon, MS Geol, a Certified Professional Geologist (CPG) with the American Institute of Professional Geologists and a Qualified Person under NI 43-101, has reviewed and approved the technical content of this news release. Mr. McGibbon has worked in exploration for gold and other commodities in Nevada and elsewhere for 30 years.

Certain information regarding Inter-Rock including management's assessment of future plans and operations, may constitute forward-looking statements under applicable securities laws and necessarily involve risks associated with mining exploration and development, volatility of prices, currency fluctuations, imprecision of resource estimates, environmental and permitting risks, access to labour and services, competition from other companies and ability to access sufficient capital. As a consequence, actual results may differ materially from those anticipated in the forward-looking statements.

Contact Information

  • Inter-Rock Minerals Inc.
    Michael B. Crombie, Ph.D.
    (416) 367-3003
    (416) 367-3638 (FAX)