Comstock Exploration & Development LLC
Our Dayton resource area and the adjacent Spring Valley exploration targets are located in Lyon County, Nevada, approximately six miles south of Virginia City. Access to the properties is by State Routes 341 and 342, both paved roads. The Dayton includes the historic Dayton, Kossuth and Alhambra patents, and the old Dayton Consolidated mine workings. The historic Dayton mine was the last meaningful underground mining operation in the Comstock District, before being closed after the War Act in October 1942, which closed down all gold mining operations in the United States and its territories.
The Dayton resource area ranks as the Company’s top exploration and development targets. In January 2014, the Lyon County Board of Commissioners approved strategic master plan and zoning changes on the Dayton, Kossuth and Alhambra mining patents and other properties located in the Dayton resource area, enabling a more practical, comprehensive feasibility study for mining. Geological studies and development planning are currently underway utilizing data from extensive metallurgical testing and assessment during 2017, an additional 30,818 feet of drilling completed in 2015, geophysical analysis and interpretation completed in 2013, and extensive geological data from pre-2013 drill programs.
For the Dayton resource, Comstock previously discovered a newly recognized, mineralized, cross-cutting shear zone. An assay sample of the material identified three feet of 0.246 ounces per ton (OPT) gold and 3.553 OPT silver. Sampling was expanded and exposed another 90.8 feet of mineralized shear zone, beginning just 245 feet inside the Dayton adit. This overall sampling program identified precious metals averaging 0.043 OPT gold and 0.404 OPT silver for the entire zone, including 7.5 feet averaging 0.121 OPT gold and 0.753 OPT silver.
The Company plans to advance the Dayton Project to full feasibility, with a production ready mine plan within two years of commencing that work. This work has not yet commenced. The plan includes expanding the current resource at the Dayton resource area and continuing southerly into Spring Valley with incremental expansion programs that include exploration and definition drilling of targets identified by the prior conventional percussion, RC and diamond core drill programs and magnetic, IP and resistivity geophysical surveys. Ground magnetic geophysical surveys identified a linear anomalous corridor, defined by a series of relative magnetic lows.
The Spring Valley exploration program is designed to target areas that have similar magnetic signatures of known economic grade mineralization. The magnetic geophysical survey was further studied and a structural interpretation was developed that illustrated multiple cross cutting structures (colored green) that are oblique to the southerly projected north/south vein trend (colored red), refer to Figure 5. Though rare due to alluvial cover, the outcropping quartz veins and outcropping crosscutting structures had definitive diagnostic magnetic signatures. The interpretation of the vein structures were derived by connecting specific magnetic attributes as identified on each 25-meter spaced survey lines. Similar structures have been identified in the Dayton and were important components for the development of economic grades of mineralization. The exploration of Spring Valley will include phased drilling programs that will continue southerly from SR 341 to the historic Daney mine site (Figure 6), with a potential strike length of approximately 9,600 feet.
In-house Dayton engineering and mine planning have resulted in profiling economic shells with multiple cutoff grade scenarios. Multiple layout plans for the mine and corresponding processing facilities have been conceptually developed and located on lands 100% privately held by the Company, thus simplifying and shortening the critical permitting chain.
The Company is proceeding to publish a separate NI 43-101 compliant, updated technical report for the Dayton resource that supports the subsequent scope of publishing a Preliminary Economic Assessment (“PEA”) for the Dayton project. The new technical report will provide not only a new resource estimate, but also a phased drilling plan for further defining and expanding the resource for sustainable, profitable mining.
The Spring Valley group of exploration targets lies adjacent to the Dayton resource area, trending south toward the southern-most end of the Comstock District that includes the southern portion of the Kossuth patented claim and the Dondero, Daney and New Daney claims and all of the Company’s placer mining claims in Spring Valley and Gold Canyon. The Spring Valley mineralized structures lie mostly concealed beneath a veneer of sediment gravels and the volcanic host rocks and the structural controls of the mineralization defined for the Dayton resource area are known to continue south into Spring Valley.