Estelle
Status: Available for Option
 Estelle Photo Gallery
 Estelle Fact Sheet (7.7MB)
Target: The Estelle property hosts high-grade gold veins spanning most of its 20 kilometer length and five kilometer width. The gold veins alone are significant targets, but the veins are spatially associated with porphyritic intrusive rocks, quartz stockworks and hydrothermal breccias at the Shoeshine and Oxide Ridge prospects, indicating potential for large bulk minable deposits. The geology shows remarkable similarity to the Donlin Creek project in western Alaska, the 22nd largest gold deposit in the world (35 million ounces of gold).
Location and Setting: The Estelle property is located in the Rainy Pass district about 160 kilometers northwest of Anchorage. The property is made up of 168 Alaska State mining claims and covers approximately 10,198 hectares. Estelle is one large, contiguous claim group that is adjacent to Kennecott Corporation's recently announced Whistler copper-gold discovery. The terrain is mountainous and challenging for exploration, but development logistics for a large mine are excellent. Road, port and power are less than 80 kilometers away along a broad, U-shaped valley.
Agreement or Terms: Millrock owns a 100% interest in the Estelle claims. Production from the property is subject to a 2.5% royalty.
Geology and Mineralization: The geologic environment of the Estelle property is similar to the geologic environment that hosts many major copper-gold and gold porphyry systems found throughout the world and, of particular relevance, within Alaska's productive Tintina Gold Belt where Donlin Creek (Barrick/NovaGold) gold and Pebble (Northern Dynasty/Anglo American) copper-gold projects are currently under development. Gold mineralization in the Rainy Pass district is associated with the Mount Estelle composite intrusive complex. This multi-phase magmatic intrusion is ~65 million years old, or of Cretaceous age - a prolific age for gold mineralization in Alaska.
Millrock has identified geological signs of a large-scale disseminated, porphyry-style gold deposit and is honed in on two intrusive hosted occurrences of interest - Oxide Ridge and Shoeshine. Indicators of a gold deposit include hydrothermal breccias, quartz stockwork veining with gold, porphyritic intrusive rocks, widespread hydrothermal alteration and abundant high-grade vein-style gold occurrences over a 30-kilometer strike length. In addition, gold has consistently been observed to occur with arsenopyrite and chalcopyrite that is present in disseminated form within the host rocks and in quartz stockworks and zones of sheeted quartz veins.
Millrock's recent exploration results support geological observations by confirming the presence of gold geochemical anomalies that further corroborate the potential for large scale gold deposits on the Estelle property. Furthermore, sampling of talus fines and rocks indicate two large gold mineralizing systems at the Oxide Ridge and Shoeshine occurrences.
Millrock President & CEO, Greg Beischer, CPG,
Collecting Geological Observations at Estelle, August 2008 (Enlarge)
Millrock Seasonal Field Technician and Mountaineer, Ryan Campbell,
Collecting Samples at Estelle, August 2008 (Enlarge)
At Oxide Ridge, sampling of talus fines that are representative of bedrock immediately uphill from the sample site has outlined a strong anomalous zone measuring 200 meters by 300 meters. The average of the 24 talus fines samples in this anomalous zone is 2.32 grams per ton gold. Several samples of altered porphyritic magmatic rocks with arsenopyrite bearing quartz stockworks assay in the 1.0 to 4.0 grams per ton gold range.
(Enlarge)
At Shoeshine, the anomalous zone is 900+ meters by 300 meters. The average of the 49 talus fines samples in this anomalous zone is 0.585 grams per ton gold. Numerous rock samples exhibiting porphyry style mineralization assay in the 1.0 to 5.0 grams per ton gold range. One sample of porphyry rock cut by sheeted quartz veinlets assayed 13.1 grams per ton gold and individual high grade quartz veins within the anomalous zone contain multi-ounce levels of gold.
(Enlarge)
The results of Millrock's recent exploration work on the Estelle property establish the potential for discovery of large scale gold deposits and warrant a 2009 drilling program to further substantiate Estelle as a highly prospective world-class gold target.
Exploration Program: The 2009 Estelle exploration program will consist of diamond core drilling at both Oxide Ridge and Shoeshine. Talus fines, structural measurements of high grade veins and porphyry style mineralization in talus will be used to target porphyry style mineralization. The program will also consist of more mapping and sampling at Oxide Ridge and Shoeshine, as well as at other prospects to determine if more porphyry targets exist on the Estelle property.
Estelle Figure 1: Schematic Cross Section (Enlarge)
Estelle Figure 2: Geology and Rock Sampling Schematic (Enlarge)
Estelle Figure 3: Quartz veins and arsenopyrite with high gold content (Enlarge)
Estelle Figure 4: Alteration and Mineralization at Estelle Property (Enlarge)
Estelle Figure 5:
South Stoney Vein oxidized sulfides and gold mineralization at the Stony Vein prospect (Enlarge)
Estelle Figure 6: Altered intrusive rocks at the Estelle project (Enlarge)
Estelle Figure 7: Rock sampling at the Shoeshine prospect (Enlarge)
Related News Releases:
May 12, 2010
Millrock Provides Corporate Update
May 4, 2010
Millrock Announces Financing and Agreement for Exploration of Estelle Gold Property in Alaska
December 3, 2009
Millrock Reports Chip Sampling Results from Estelle Project, Alaska
February 5, 2009
Millrock Announces Purchase of 100% Interest in Estelle Gold Claims, Alaska
November 13, 2008
Millrock Announces Positive Sampling at Estelle Gold Project, Alaska
April 21, 2008
Millrock Resources Inc. reports the issuance of 650,000 common shares of the Company to Talon Gold
April 9, 2008
Millrock Announces Acquisition of the South Estelle Gold Property in Alaska
|
