Gilbert South

Location, Infrastructure, and State of Exploration

This Project is comprised of 128 unpatented claims for a total of 1,050 hectares located 42 km west of Tonopah, Nevada (Figure 1) and is accessed by a US highway and 8 kilometers of county-maintained dirt roads. A well-developed network of secondary dirt roads spans the property.  

 Gilbert South lies within the Gilbert District, which has a long history of both production and recent resource drilling. Multiple small shafts and adits on the Property are developed along gold bearing epithermal quartz veins and vein stockworks. The Company considers this to be one of the best epithermal prospects in the Walker Lane, which has a total gold endowment of over 80 Moz gold and 700 M oz silver[3].

The Property lies in a complex landscape of dacite and andesite flow domes and intrusions (Figure 2) that host multiple low sulfidation epithermal vein swarms throughout the volcanic package (Figure 3). The volcanic host rocks are commonly altered to clay minerals of illite/smectite, typical of high-level, hot springs related, epithermal systems. High grade gold occurs at the surface in both quartz/chalcedony veins and in hydrothermal breccia.  Grades locally exceed 30g/t gold. Historic reverse circulation drilling, which occurred before Orogen Royalty’s recent surface exploration, indicate long runs of low-grade gold mineralization, but this drilling did not test the most prospective surface geochemistry, nor the potential deep feeder structures, which can host bonanza grades in this type of system. Field work by the Company’s technical team who specialize in epithermal systems suggest that the types of vein textures and alteration are those that typical near the top of these systems (Figure 4).

Overview of the Opportunity

With several historic mines, robust gold in rock chip and soil samples and abundant outcrop of quartz veining, this property is prime for a successful exploration program. The northern portion of the Property hosts the historic Ohio Fault Zone Target Area, which occurs on the margin of a shallow, prospective pediment. Rock samples at the Ohio Target return assays of up to 8.6 g/t gold in silicified tuff and rhyolite.  A historic drillhole contained an intercept of 33.5 m at 0.34 g/t gold. It has untested gold-in-soil and gold-in-rock anomalies. The Pretty Boy/Eastern Bounding Fault Zones Target Area yielded a 30.7 g/t gold vein sample with visible gold in a crustiform quartz vein. There are no drillholes in the vicinity of this sample. Additional this area has gold in rock samples up to 16.8 g/t taken over the span of a one-meter channel. A drill hole intercept near the Corky area contained 1.5 m at 3.8 g/t gold. This area hosts numerous closely spaced veins that have never been adequately sampled (see photo in Figure 5). The Company’s goal is to understand the context of these historic shallowly mined occurrences in the context of the large, regional epithermal system in order to better focus on the primary upflow zone that fed the entire system which could host a multi-kilometer long bonanza vein. 

Regional and Project Geology

Gilbert South exists in the Southern Monte Cristo Range which is comprised of a complex series of volcanic rocks that were erupted during the formation of the ancestral Cascade volcanic arc[5]. Known gold mineralization appears to correlate with multiple pulses of volcanism that range from ca. 22 Ma to 5 Ma. This episodic volcanism is associated with seven gold deposits which combined, have produced >1 Moz of gold[5].

Volcanism is one key factor involved in the development of a low sulfidation epithermal gold deposit, a second critical factor leading to the development of a prolific gold deposit is an appropriate structural setup, which Gilbert South has. The Monte Cristo Range lies in the greater Walker Lane tectonic region which extends from southeast to northwest across the southwestern portion of Nevada. The Walker Lane is a broad zone of crustal shearing and extension and a region with abundant gold and silver deposits. Strike-slip and high angle extensional faults are common features of Walker Lane tectonism and are often host to gold deposits in the region[4,5]. A large strike-slip fault transects the property from NW to SE, taking a significant right-step across the central portion of the property. Strike-slip faults are a prime structural feature as they quite often “step” from one location to another. These step overs are ideal points for the crust to pull apart, creating open space for gold bearing fluids to infiltrate and form a healthy gold deposit (Figure 6). Such step overs have formed deposits such as the Comstock Lode (~300 km to the NNW)[1] and Fruta Del Norte in Ecuador[6]. It is within the extensional openings formed as the crust pulls apart that mineralized quartz veins and stockwork veining typically form, a feature observed at Gilbert South.  

As a whole, Gilbert South contains all of the features the technical team would identify as integral to discovering a large low sulfidation epithermal vein gold deposit; favourable structural setting, volcanism active during extensional faulting, and the degree of erosion has not carried away the deeper gold hosting portion of the system.  The Company is excited about the exploration possibilites at this property.

The Company's Initial Exploration Results

Results from the first phase of rock chip sampling and hyperspectral mapping suggest that the highest grade gold zone in this low sulphidation epithermal gold system may exist just below the surface.  Gold in rock chips range from 7.4 g/t up to 30.7 g/t gold in samples collected across the entire property. Soil results have demonstrated that the 1.5 km wide region in between the 2.5 km long Bighorn and Pretty Boy/EB faults is anomalously mineralized with gold in soils containing <0.70 ppm gold. Surface mapping indicates there are three primary north-south trending fault zones across the property that are associated with gold mineralized epithermal veins: the Pretty Boy-East Bounding fault zone, the Ohio fault zone, and the Bighorn fault zone. All three fault zones are structurally linked components of a right-stepover on a regional fault. This regional fault and related structures are key features of many gold-silver deposits in the prolific Walker Lane mineral trend. 

Pretty Boy/East Bounding fault zone targets

The Pretty Boy and East Bounding fault zone is a 0.75 km wide zone of both stockwork veins and through- going bladed calcite and quartz veins measuring 1-2 meters wide.  The exposure of the vein network along strike varies due to topography and post-mineral gravel cover, but individual vein outcrops can be linked for 2.5 km along strike. Vein textures from mine workings and outcrop indicate a very shallow level of the epithermal system is exposed, suggesting that the primary boiling horizon for epithermal system could be preserved at depth.

The linked Pretty Boy and East Bounding faults are the focus of the most robust ammonium mineral alteration anomaly as detected by both an airborne hyperspectral survey as well as the handheld spectral survey on individual outcrops. Such an anomaly is interpreted to indicate a zone ~2 km long with a deep-rooted structure serving as the primary conduit for hydrothermal fluids that deposited gold-bearing epithermal veins. The direct link between ammonium and gold mineralization has been documented in other low sulfidation epithermal systems (Figure 7)[2,7,8,9,10,11,12]. The area of the ammonium anomaly is closely correlated with the highest-grade rock samples (Figure 8), as well as a strong gold in soil anomaly which is helping the technical team refine specific drill targets. Typically, rock samples are taken on stockwork veinlets which the Company’s technical team interprets to represent the uppermost portions above the boiling horizon of a larger vein that could be consolidated at depth (Figure 9). As is typical for epithermal systems, the vertical extent of mineralization is controlled by the level of boiling during vein formation, which could extend hundreds of meters down dip. Surface samples are predominantly taken from a welded tuff, which is rather friable and hosts mineralization as numerous stockwork veinlets. At depth the very competent argillite basement rock is a more suitable host for large open fractures and bonanza veins, a feature common to other epithermal systems in Nevada[10].

Ohio fault zone target

The Ohio fault is characterized by a 1 km long fault that traverses relatively benign topography and is thus not well expressed at the surface. One- to two-centimeter-wide quartz veinlets are observed in dump samples from within this fault zone. Historical rock samples include grades of up to 8.6 g/t Au.

Bighorn fault zone target

The Bighorn fault zone is characterized by three subparallel faults, the easternmost of which has a semi-continuously exposed calcite vein that averages 1-3 meters wide and is 1.5 kms long.  The texture of the calcite vein, rhombohedral to banded, suggests the vein is the very shallowest exposure of an open fissure epithermal vein. At the northern extent of the Bighorn fault zone, the single vein horsetails into numerous en echelon veins within a poorly consolidated rhyolite dome. The strongest gold anomalies in the property wide soil survey confirm the surface expression of this target. Pending interpretations from a geophysical survey currently in progress will serve to image the potential for veins/silicified bodies at depth and that are obscured by the volcanic edifice at the surface.

Secondary, Lower-Priority Targets Associated with Mafic Volcanics

The lower-priority vein systems are the Redback, Greenback and Indiana, that all are hosted in the younger sequence of mafic volcanics.  The veins from these target areas are typically 1-2 meters wide and are chalcedonic in texture, indicating very shallow preservation above the boiling horizon.  Due to the lower apparent concentrations of gold within these targets, and the targets not being clearly associated with a regional structural framework they have been the secondary focus of exploration activity. Again, the pending soil results will yield additional insights for potential at these target areas.

Description of Program

Numerous historic prospect pits that were not on previous maps were discovered during Phase I field work. Following the soil survey (results pending), the Company’s technical team also conducted a 2-week reconnaissance mapping program consisting of field checking existing 1:24,000 scale mapping and rock sampling: numerous channels and chips were taken at existing outcrops near the historic mine workings for which the Company had no or extremely limited data, especially in the Pretty Boy-East Bounding fault area. Two methods of spectral analysis were utilized by the technical team to expedite vectoring to the zones of highest temperature alteration and potential upwelling within the laterally extensive hydrothermal system. The first method used was remotely sensed hyperspectral data, acquired at a 2.5-meter pixel resolution by a fixed wing aircraft that captured >320 bands from 400-2450 nm. This data was acquired, and preliminary processing and interpretation completed by Spectir Advanced Hyperspectral Solutions (https://www.spectir.com/). Their interpretation mapped a widespread illite alteration extending across the property. The preliminary data received final interpretation by Browning Geosciences (https://www.browninggeoscience.com/) that used spectra from field collected samples to be used as ground truth and included in the spectral library for refinement in mineral identification of the  remote sensing data. The final interpretation identified multiple anomalies of ammonium illite within the laterally extensive field of illite alteration. Knowing that research demonstrating that ammoniated hydrothermal fluids interact with potassium-bearing minerals in wall work material to form ammonium illite or buddingtonite patterns along deep-seated structural fluid conduits and these same fluids also transport gold(8) the technical team used this as a parameter to vector field efforts.  To further verify and refine the ammonium illite anomalies the technical team also conducted a two-week ground based spectral mapping program using an ASD TerraSpec Halo mineral identifier to collect data in real time while traversing the project area. 1953 spectral measurements were taken across an equal number of samples sites. Mineral identification is done automatically by the unit by comparing measured spectral profiles to the USGS spectral library. 193 buddingtonite and 253 ammonium illite sample sites were identified at a >90% confidence level by the machine. A select set of the machine identified spectra were verified for their accuracy by Browning Geosciences and were found to be accurate mineral identifications. Field collected spectra verified the remotely sensed ammonium anomalies and identified which structures were the focus of ammonium illite and buddingtonite. 

 

Next Steps to Drill Targets

The Company currently has a geophysical survey underway (Figure 10) to characterize the potential depths of bonanza vein targets at the Pretty Boy, East Bounding fault zones and the Bighorn fault zone. Additionally, the survey design will test multiple portions of the Sunset fault zone, within the Ohio target and the Redback area which revealed an anomalous gold zone in soil results. Geophysics will be done in conjunction with ongoing mapping of veins and structural features to characterize variations in vein textures and orientation that may have a direct influence on bonanza grade ore shoots at depth.

Communities and the Environment

The pursuit of environmentally friendly and socially responsible mineral exploration and potential development guides the efforts and activities of Eminent Gold. Eminent Gold and our partners understand that the broad societal benefits exploration and mining can bring, but only when the risks and hazards of disturbing the environment are managed through careful and thoughtful implementation of sustainable practices. Eminent Gold strives to maintain the highest industry standards of environmental protection and community engagement at all of its projects. 

Eminent Gold believes that sustainability includes pursuit of three mutually reinforcing pillars: environmental and cultural heritage protection; social and community development; and economic growth and opportunity. Eminent Gold assesses the environmental, social and financial benefits and risks of all our business decisions and believes this commitment to sustainability generates value and benefits for local communities and shareholders alike.

Ownership and Agreements

Eminent has entered into an option agreement (the “Option Agreement”) with Orogen Royalties Inc. (“Orogen”), whereby the Company acquired the Option to purchase 100% of Gilbert South. The Company has up to five years to acquire a 100% interest in the 110 unpatented claims (890 hectares), by making cumulative cash payments of USD $875,000 (collectively, the “Cash Payments”), cumulative share payments of 500,000 common shares (“Shares”) in the capital of the Company (collectively, the “Share Payments”), and a total of USD $100,000 in expenditures during the option period.

The Agreement

In accordance with the terms and conditions of the Option Agreement, in order to exercise the Option and acquire the Property the Company must make the Cash Payments and Share Payments in accordance with the following schedule:

  • (a) USD $25,000 and 50,000 Shares on June 23, 2021 (the “Effective Date”);
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  • (b) USD $50,000 and 100,000 Shares on or before the first anniversary of the Effective Date;
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  • (c) USD $100,000 and 150,000 Shares on or before the second anniversary of the Effective Date;
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  • (d) USD $100,000 and 200,000 Shares on or before the third anniversary of the Effective Date;
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  • (e) USD $100,000 on or before the fourth anniversary of the Effective Date; and
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  • (f) USD $500,000 on or before the fifth anniversary of the Effective Date.

Additionally, the Company must incur an aggregate of USD $100,000 in expenditures on the Property.

The Property is comprised of four different claim blocks: (i) 2 unpatented claims known as the “Nevada Select Claims”, (ii) 27 unpatented claims known as the “GL Claims”, (iii) 81 unpatented claims known as the “Timberline Claims”, (iiii) 18 unpatented claims known as the “EB Claims”. The Timberline Claims are currently subject to a 3% Net Smelter Return royalty and the Nevada Select Claims are currently subject to a 2% Net Smelter Return royalty. Upon exercising the Option, the Company will grant Orogen a 2% Net Smelter Return royalty on the GL Claims (the “GL Royalty”). The Company shall have the option and right to repurchase one percent (1%) of the GL Royalty for $1,000,000, thus reducing the GL Royalty to one percent (1%) of all products from the GL Claims. The Company is responsible for Property holding costs during the duration of the Option Agreement.

References

  1. Berger, B. R., Tingley, J. V., and Drew, L. J., 2003, Structural localization and origin of compartmentalized fluid flow, Comstock Lode, Virginia City, Nevada: Economic Geology, v. 98, no. 2, p. 387-408.
  1. Canet, C., Hernández-Cruz, B., Jiménez-Franco, A., Pi, T., Peláez, B., Villanueva-Estrada, R. E., Alfonso, P., González-Partida, E., and Salinas, S., 2015, Combining ammonium mapping and short-wave infrared (SWIR) reflectance spectroscopy to constrain a model of hydrothermal alteration for the Acoculco geothermal zone, Eastern Mexico: Geothermics, v. 53, p. 154-165.
  1. Energyandgold.com, 2020, A Junior Mining Management Team That Doesn’t Know How To Lose Is Back With The Next Incredible Opportunity In Nevada Gold Exploration: Energyandgold.com.
  1. John, D. A., 2001, Miocene and early Pliocene epithermal gold-silver deposits in the northern Great Basin, western United States: Characteristics, distribution, and relationship to magmatism: Economic Geology, v. 96, no. 8, p. 1827-1853.
  1. John, D.A., du Bray, E.A., Henry, C.D., and Vikre, P.G., 2015, Cenozoic Magmatism and Epithermal Gold-Silver Deposits of the Southern Ancestral Cascade Arc, Western Nevada and Eastern California in Pennell, W.M., and Garside, L.J. (eds.) New Concepts and Discoveries, Geological Society of Nevada, Reno, Nevada.
  1. Leary, S., Sillitoe, R. H., Stewart, P. W., Roa, K. J., and Nicolson, B. E., 2016, Discovery, geology, and origin of the Fruta del Norte epithermal gold-silver deposit, southeastern Ecuador: Economic Geology, v. 111, no. 5, p. 1043-1072.
  1. Krohn, M. D., Kendall, C., Evans, J. R., and Fries, T. L., 1993, Relations of ammonium minerals at several hydrothermal systems in the western US: Journal of volcanology and geothermal research, v. 56, no. 4, p. 401-413.
  1. Mateer, M. A., 2010, Ammonium illite at the Jerritt Canyon district and Goldstrike property, Nevada: Its spatial distribution and significance in the exploration of Carlin-type deposits, University of Wyoming.
  1. Simpson, M., Reflectance spectrometry (SWIR) of alteration minerals surrounding the Favona epithermal vein, Waihi vein system, Hgoldraki Goldfield, in Proceedings Proceedings of the GoldsIMM New Zealand Branch Annual Conference, Dunedin, New Zeeland2015, p. 490-499.
  1. Smith, J. M., 2014, Controls of High Grades within the Clementine Vein System in the Hollister Low-Sulfidation Epithermal Gold-Ag Deposit, NV, University of Nevada, Reno.
  1. Soechting, W., Rubinstein, N., and Godeas, M., 2008, Identification of ammonium-bearing minerals by shortwave infrared reflectance spectroscopy at the Esquel gold deposit, Argentina: Economic Geology, v. 103, no. 4, p. 865-869.
  1. Yang, K., Browne, P., Huntington, J., and Walshe, J., 2001, Characterising the hydrothermal alteration of the Broadlands–Ohaaki geothermal system, New Zealand, using short-wave infrared spectroscopy: Journal of Volcanology and Geothermal Research, v. 106, no. 1-2, p. 53-65.

Gilbert South Project Figures