Sierra begins airborne magnetic survey at its gold projects in Nevada
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For Immediate Release
Sierra Grande Begins Airborne Magnetic Survey at its B&C
Springs and Glitra-Sat Gold Projects in Western Nevada
Surrey, British Columbia, June 28, 2022, Sierra Grande Minerals (the “Company” or “Sierra”)
(CSE: SGRO) (OTCQB: SIERF) (FSE: SRR) ("Sierra" or the "Company") is pleased to announce that
it has commenced drone-borne magnetic (drone-mag) surveys at both its B&C Springs (“B&CS”) and
Glitra-Sat gold projects in Western Nevada (see Images 1-3). Sierra will also be conducting geological
mapping, prospecting and rock and soil geochemical sampling work while on site. The airborne
surveys will be conducted by Pioneer Exploration.
The drone-mag surveys at B&CS and Glitra-Sat will cover the entirety of the two properties. Flight
lines will be spaced 50m apart and flown on azimuths perpendicular to known and /or interpreted
stratigraphic, structural, and mineralized and altered trends (see Images 1-2). Technical details of the
surveys, and products thereof, are given below.
The aim of the surveys is to outline altered and mineralized trends on the properties, which may
be expressed, for example, as magnetic lows reflecting magnetite destructi ve alteration within
relatively magnetic host rocks . This should prove particularly helpful in areas where mineralized
trends appear to continue beneath overburden-covered areas.
At the Glitra-Sat property a number of areas fall into this category, such as along trend both north and
south of the Glitra occurrence, and at the Sat occurrence, where a known gold mineralized zone is
covered to the east by unconsolidated material of the pediment, and to the south by alluvial deposits
in the Stonehouse valley (see Image 2).
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On the B&CS property a similar situation exists. There , extensive but generally thin overburden at
the head of a broad and gently -sloping pediment obscures a large area between precious metals
showings on the B&CS propert y. On the west and abutting Almadex’s Davis Gold property are
recently-sampled showings which yielded a number of high -grade grab samples, including those
returning 17.35, 30.9 and 150.5 g/t Au (see Image 1). On the east is the Mildred Mine area, where soil
sampling yielded a number of highly anomalous samples (please see News release dated August 31,
2021, and Image 1). The new samples were collected by prospectors earlier this year, following the
Company’s recognition of the potential of this area, and after staking program. Furthermore, limited
outcrop exposed in drainages lying within the bounds of the wide pediment area between the two
gold-mineralized areas on the Company’s claims indicates that the overb urden is thin and that
alteration is at least locally present along structures within the rocks exposed therein.
Following the drone-mag surveys, the Company expects that follow-up work will be undertaken
with an eventual goal to define drill target s along trends showing the greatest potential to hos t
economic mineralization. That work is expected to include ground-based CSAMT (controlled source
audio-magnetic telluric) and/or IP (Induced Polarization) geophysical surveys, as well as d etailed
mapping and sampling.
“As per our 2022 exploration plan, we are very pleased to continue exploration at our
gold projects in Nevada. It will be exciting to see the results of these surveys and to
plan aggressive follow-up work. With numerous high-tenor soil geochemical targets at
both Glitra-Sat and B&C Springs, our expectation is that the airborne magnetic data
yields further encouragement that carries us closer to our goal, which is ultimately to
drill-test some high -potential targets on both properties ” commented CEO, Sonny
Janda.
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About the Projects
B&C Springs
The B&C Springs property is located in the southern Paradise Range in west-central Nevada, within
the Fairplay Mining District. The property abuts Almadex Minerals Ltd.’s Paradise Valley project
on its east side (see Image 1).
Recent soil geochemical sampling at B&CS clearly shows that anomalous copper, molybdenum and
silver geochemistry is closely associated with a west -northwesterly trending porphyry dike swarm
crossing the northern part of the property. The anomalous zone is extensive, running from beyond the
previously drilled Mo -Cu-Ag mineralized zone at B&C Springs on the east, to beyond the western
boundary of the claim group, a distance of over 4 km. The anomalous values are of high tenor, with
a broad zone, nearly a km in width, that has many values exceeding 100 ppm copper, and which range
up to 1 ,200 ppm copper. Elevated Ag, Mo, Au, Hg and Sb are commonly associated with the
anomalous copper values, but this latter expression is most evident in a semi -circular “halo” around
the northern margins of the greenstone “cap” to the B&C Springs Mo-Cu-Ag mineralized zone.
In the vicinity of the Mildred Mine and toward the southwestern part of the property, where there are
numerous historical prospecting pits, adits and shallow shafts, the soil geochemical response for gold
and silver confirms the potential of that area for precious metals mineralization. This expression hints
at further potential for precious metals to the west beneath the shallow overburden of the pediment
area, and that potential was still further reinforced by the results of Sierra’s recent staking -related
prospecting program, in which grab samples returned values ranging up to 150.5 g/t gold (see above
and Image 1).
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Image 1. B&C Springs Plan View with Highlighted Soil Geochem Data and Survey Area
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Glitra-Sat
The Glitra/Sat properties are sister properties, with the relatively small “Orbit” property lying between
(see Image 2). They are located in Pershing County, western Nevada, in the Seven Troughs Range of
the Farrell Mining District, which hosts numerous historical and modern‐day mineral occurrences and
deposits. The properties are contiguous with Millennial Precious Metals Wildcat Project, which hosts
a 43-101 compliant inferred mineral resource of 67.6 million tons grading 0.37 g/t Au totaling 824,000
oz Au, and they lie a few kms north of Timberline Resources Seven Troughs Project (see Image 2).
On the Glitra property, r esults from a previously completed soil -geochemistry su rvey identified a
promising +1km north-northeast trending mineralized and altered zone with a pronounced epithermal
Au-Ag-As-Hg signature and a width ranging up to 150 to 200 metres.
At Sat, strong soil sampling results also appear to outline a north-northeast trending anomalous zone,
or zones, with a pronounced Au -Hg-As-Ag signature that most likely reflects structurally -hosted
epithermal mineralizing system(s) (see Image 2).
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Image 2. Glitra-Sat Plan View with Highlighted Soil Geochem Data and Survey Area
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Image 3. Nevada Regional Setting with Sierra Projects
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Drone-Mag Survey Technical Details
The drone-mag survey at B&CS will feature 50 metre line spacings along NE -SW azimuths, with a
total planned survey of 1,210 line kilometres (see Image 1.).
The drone-mag survey at Glitra-Sat will also feature 50 metre line spacings but along E-W azimuths,
with a total planned survey size of 648 line kilometres (see Image 2.).
Data Deliverables for the surveys will include:
➢ Technical Reports
➢ Total Field Magnetics Maps
➢ First Vertical Derivative Map
➢ Analytical Signal Map
➢ Processed, micro-leveled line by line database of the magnetic data
➢ Raw survey data and geodatabase digital files and base station data
➢ 12m and 5m resolution DSM files
Technical data pertaining to this new release was reviewed and approved by Charles J. “Charlie”
Greig, MSc., P.Geo., a qualified person under National Instrument 43-101.