Las Chispas

The Las Chispas property is located approximately 180 kilometres northeast of Hermosillo, Sonora, Mexico. The community of Arizpe (estimated population 2,000) is located approximately 11 kilometres to the north of the property. The property consists of 21 concessions totalling 1377.50 hectares.

History

In 1640, rich silver veins where discovered near Arizpe by soldiers under the command of Pedro de Perra. The property did not receive any notable exploration or production until the late 1800s. From 1880 to 1930, several mines on the property had intermittent production. From public information, approximately 100 million ounces of silver and 200,000 ounces of gold were cumulatively produced from the property. Since 1930, no significant work has been completed on the property.

Las Chispas

During the early 1980s, a local Mexican company reprocessed old waste and tailings dumps from Las Chispas. Processing was by vat leaching with no production records available.

Geology

Geologically, the Las Chispas property consists of a Late Cretaceous – Early Tertiary low sulfidation epithermal system. Host rocks are volcanic tuffs, rhyolites, agglomerates and rhyolite breccias. Andesite dykes are noted in underground workings sub-parallel to mineralized structures.

The Las Chispas Mine is known for its world-class silver mineral specimens including polybasite, stephanite, native silver and pyrargyrite. Specimens are on display in private collections and museums worldwide.

Historical Production

Mineralization occurs in 0.5 to 5 metre wide veins with adjacent stockwork and breccias trending northwest- southeast for 1 to 1.5 kilometres. Depth from surface of known mineralization is estimated at 300 metres. Main veins dip 55 to 85 degrees to the southwest. Fourteen epithermal veins have been previously defined on the property of which 3 have had notable production. The historical producing veins included Las Chispas, William Tell, and Babicanora. From public information, the Las Chispas mill production between 1908 through 1911 was approximately 25,000 tonnes grading 35 gpt gold and 4,500 gpt silver totalling an estimated 25,000 ounces of gold and 3.2 million ounces of silver. Several kilometres of underground workings exist on the property and are partially accessible.

Las Chispas

Current Work Program

Phase II Exploration Program

SilverCrest´s current underground and surface drill programs are focused on four of the 19 veins identified at Las Chispas; the Las Chispas, William Tell, Babicanora and Varela veins. As part of the Company's ongoing Phase II exploration program, systematic grid drilling continues at the Las Chispas Main Vein ("Main Vein"), comprised of infilling and expanding previous Phase I successful results. Recent drill results indicate a newly discovered unmined high grade vein immediately adjacent to the Las Chispas Main Vein and historic workings (see Figures below). The new vein, named "Giovanni", and the Las Chispas Main Vein are two of 19 epithermal veins that have been defined on the Property to date. Four drills are currently working at the Las Chispas, William Tell, Varela and Babicanora veins.


Click to enlarge

Click to enlarge

Click to enlarge

The most significant result from the latest drill program, is an intercept in Hole LC17-37 of 2.3 metres grading 3.57 grams per tonne ("gpt") gold and 577.8 gpt silver, or 845 gpt silver equivalent ("AgEq"; based on a ratio of 75 (Ag):1 (Au) and 100% metallurgical recovery) including 0.5 metres grading 1,199 gpt AgEq. Also noteworthy is a 2.1 metre intercept grading 3.40 gpt gold and 329.7 gpt silver, or 585 gpt AgEq in Hole LC17-35.

For more details, please refer to the table under "Assays" and news release, dated May 11, 2017.

Las Chispas holes LC16-23, 24, 27, 28, and LC17-31 and 32 had intercepts below cutoff grade of 150 gpt AgEq in either the Main, Giovanni or Espiritu Santo Veins. Holes LC16-25, LC17-30 and LC17-33 were drilled at the William Tell Vein. Hole LC17-40 was drilled at Varela Veins which will all be reported in due course.

All drill holes have intercepted epithermal quartz veining, stockwork veinlets, and/or breccia. The Giovanni Vein is a quartz-argentite stockwork zone up to seven metres wide.

The majority of the Company's exploration work to date has been on the Las Chispas Main and Giovanni Veins. More detailed work is ongoing to further expand and define mineralization to the southeast along trend and define resources for future estimation. Closely spaced infill drilling will be completed from several underground stations along the Las Chispas 600 level main access within the next few months.

As of today, SilverCrest has reported drill results from six underground holes at Babicanora. All holes have intercepted epithermal quartz veining, stockwork veinlets, breccia and/or shears trending NW to SE.

Furthermore much of the mineralization in the drill-tested area is still intact. Initial drill hole results at the Babicanora vein suggests high-grade mineralization and a continuous, well-defined mineralized vein and structure that averages over four metres in true thickness.

For more details, please refer to the table under "Assays".

Underground access to the Babicanora vein is via a 230-metre long 4 by 4 metre horizontal adit, which was driven by a French company during the 1860s.

Babicanora adit

Furthermore, at least six historic underground mining chutes remain intact on the adit level and are filled with undetermined amounts of mineralized material. The Company has removed, sampled and stockpiled approximately 800 tonnes of this mineralized material.

Mineralized fill

To date, the Company has completed approximately 85% percent of the planned Las Chispas Phase II exploration program with 38 core holes having been drilled, totalling about 8,500 metres. Twenty four holes (24) have been drilled in the Las Chispas and William Tell veins for expansion and future resource delineation, with twelve (12) drilled in the Babicanora Vein and drilled two (2) holes, one each of the Espiritu Santo and Varela veins. Based on positive Phase I and Phase II drilling results to date, the Company's operations have expanded to a total of four drills; three for surface drilling and one for underground drilling.

Underground Rehabilitation Update


Click to enlarge

Click to enlarge

Click to enlarge

To date, the Company has accessed approximately 9.5 kilometres of underground workings, with an additional 2 kilometres to be explored over the next several months. As SilverCrest rehabilitates the underground workings, the Company continues to systemically collect samples at intervals of two to three metres along strike lengths of veins. The Company recently collected a total of 72 samples on the Las Chispas 550 level from 120 metres of underground access as reported below. Of the 72 samples tested, 43 were mineralized samples with 19 used for true thickness assay composites stated below. The remaining samples were of hangingwall and footwall material. Sampling locations and widths are restricted to historic workings which may only represent part of the mineralized vein, stockwork, or breccia. The Company has previously drilled three holes in this area, intercepting high grade mineralization with true thicknesses from 1.0 to 7.2 metres. Further surface and underground drilling is planned as part of the Phase II program.

N. Eric Fier, CPG, P.Eng., President and Chief Executive Officer of the Company, is the Qualified Person under National Instrument 43-101, Standards of Disclosure for Mineral Projects, responsible for the preparation of the technical information included in this website and for supervision of field activities related to the Company projects.

Email Sign Up

Sign up to receive latest news and recent projects from SilverCrest Metals.