Hasbrouck Gold Project Exploration
West Kirkland’s district-scale exploration objective is to find gold that can be trucked to the planned and permitted heap leach processing facilities at Three Hills and Hasbrouck Mines.
West Kirkland has identified high-grade epithermal vein and bulk tonnage exploration targets at:
- Hill of Gold (100% West Kirkland)
- Three Hills (75% West Kirkland, 25% Waterton)
- Hasbrouck Peak (75% West Kirkland, 25% Waterton)
Gold Mountain Exploration
West Kirkland leased Gold Mountain in late 2017 and through 2018 performed extensive surface sampling and some limited drilling which was successful in identifying multiple targets.
Gold Mountain is 1 mile east of Hasbrouck Peak – a short trucking distance from the planned Hasbrouck Mine heap leach and 5 miles from the planned and permitted Three Hills Mine heap leach.
In late 2019 the Company elected to terminate the lease to minimize cash outflows in conformity with the Company’s stated strategy (see News Release of August 12, 2019). It is conceivable that Gold Mountain might be leased again at some future time as its prospectivity remains good. We detail the Company’s view of Gold Mountain’s exploration potential here.
After entering the lease in 2017, West Kirkland identified a significant new at- or near-surface gold and silver target.
Targets on Gold Mountain targets were identified by analyzing the extensive historic exploration data-base. Historic gold grades along existing drill-roads were found to be as good or better than Hasbrouck Mineral Reserve grades. The large historical data base together with field samples and observations allowed West Kirkland to map the bedding of known structures and completed a three-dimensional geological model of Gold Mountain.
The Hasbrouck Technical Report summarizes one of the key ore controls at Hasbrouck as: “Stratigraphic control, whereby the porous volcaniclastic units are preferentially mineralized, is prevalent throughout the deposit, but is especially evident in many of the moderate-grade zones…”. Comparison of the new Gold Mountain three-dimensional model to the flat-bedded controls on the adjacent Hasbrouck Peak demonstrate the potential for a relatively flat-lying, thick, and near-surface deposit at higher elevation on Gold Mountain.
Some historic drilling did test the flat-lying, gold bearing zones that form the new targets, but when the historic road-cut were sampled and drilled in the 1980’s and 1990’s, the flat-bedded host rock mineralization control was likely not recognized or understood. Gold prices were also lower then, prompting exploration to focus on high-grade targets.
From the database 1,608 feet (490 meters) of drill roads into Gold Mountain were identified as having the gold and silver assay values reported below. Composited 20 foot (7m) samples were taken along the drill roads.
Historic Road-cut Continuous 20 foot Chip Sample Sections
|Surface Samples||Interval (ft)||Gold (g/t)||Silver g/t||Location|
|Road-cut 1||441||0.87||2.4||NE Side (26 samples)|
|Road-cut 2||917||0.65||13.2||SW Side (47 samples)|
|Road-cut 3||250||0.68||22.5||East-High (16 samples)|
Mineralized drill roads were found to have similar grades to the Hasbrouck Mine Reserves which has grades of 0.58 g/t Au and 7.9 g/t Ag and which is located approximately one mile to the west. Mineralized drill roads are close to the flat-dipping contact of two mapped units and extend over a large area. Three 250-foot sections of road-cut have low values and are interpreted as being off the layered contact. Some mapped and well-mineralized drill roads were not previously sampled; West Kirkland subsequently sampled these.
Results of the historic drilling under the drill roads are given in the table below. Historic deep drilling which cut across the mountain is interpreted to have been collared in or under the newly identified flat-bedded contact. Historic drilling targeted large high-grade structures below this layer. Areas above historic drill roads host the new flat-bedded targets and are open for new road-cut sampling/trenching and further drilling. The historic drill holes that intercept the newly-identified flat-bedded targets have similar grades to the Hasbrouck and Three Hills Reserves. See table below.
Historic Drill Holes in the Area of the Flat Road-cut Targets
|Drillhole||Interval (ft)||Gold (g/t)||Silver g/t||From (ft)|
The interpretation of stratigraphic control at the nearby Hasbrouck deposit supports West Kirkland’s interpretation at Gold Mountain.
Estimation of the overall dip and thickness of the newly-identified targets requires further roads to be cut, both above and below existing drill roads, as well as several short vertical holes drilled into exposed mineralization.
Historic Drilling in the Adit Area
Drilling by Falcon in the 1980s and Echo Bay in the 1990s provided results consistent with the results from underground sampling by WKM both in both grade and position of the mineralized structures.
The overall target area into the hill-side of the Gold Mountain Adit area to the west and towards the Divide Lode to the east provides a target area of approximately 600 feet (180 meters) along strike, 600 feet (180 meters) vertically and 150 feet wide (50 meters).
|HISTORIC DRILLING INTERCEPTS - ADIT AREA|
|DH135/C1||40||12.2||1.19||60||18.3||Bottomed in mineralisation||100||30.5||Falcon|
|C2-70||150||45.7||0.22||Surface||Surface||Bottomed in mineralisation||150||45.7||Falcon|
|C3-45||150||45.7||0.65||Surface||Surface||Bottomed in mineralisation||150||45.7||Falcon|
|C3-70||70||21.3||0.44||Surface||Surface||Bottomed in mineralisation||150||45.7||Falcon|
|G-3-1||15||4.6||0.29||45||13.7||Bottomed in mineralisation||60||18.3||Falcon|
|G-3-2||15||4.6||0.27||Surface||Surface||Bottomed in mineralisation||15||4.6||Falcon|
|G-4-2||45||13.7||0.35||Surface||Surface||Bottomed in mineralisation||45||13.7||Falcon|
2018 Surface Sampling
In 2018, West Kirkland reported new high-grade assay results from continuous sampling completed at surface on the Gold Mountain target, located near the Company’s Hasbrouck Gold Project, which outline clear targets for shallow surface drilling. Assay results from the east and central areas of the Gold Mountain target include:
- 160 feet (49m) with an average of 4.34 g/t gold (across strike)
- 140 feet (43m) with an average of 4.32 g/t gold (across strike)
- 140 feet (43m) with an average of 2.15 g/t gold (across strike)
- 140 feet (43m) with an average of 3.40 g/t gold (across strike)
- 100 feet (30m) with an average of 3.67 g/t gold (across strike)
|Surface Samples||Length||Gold (g/t)||Location||Orientation||Reported|
|12||240’ (73m)||0.87||SR-04||Across strike||May 17 2018|
|11||220’ (67m)||1.27||SR-01||Across strike||June 07 2018|
|5||100’ (30m)||1.85||SR-05||Across strike||June 07 2018|
|5||100’ (30m)||1.49||SR-02||Across strike||June 07 2018|
|3||60’ (18m)||1.32||SR-02||Across strike||June 07 2018|
|7||140’ (43m)||1.05||SR-09||Across strike||June 07 2018|
|4||80’ (24m)||0.53||NP-12||Across strike||June 07 2018|
|6||120’ (37m)||0.65||NP-13||Across strike||June 07 2018|
2018 Underground Channel Sampling in the Adit Area
Underground channel sampling on historic gold veins from the early 1900’s completed by the company, after safely entering underground workings, has outlined grades of interest for modern heap leach extraction and open pit mining. The underground sampling provides sections approximately 90 feet (30 meters) vertically below surface on three levels across the mined veins and surrounding rock. The underground workings are flat adit tunnel drives that go into the hillside. The adit workings go along gold mineralized veins and cross-cut them. Although the workings drove along veins for up to 1,800 feet (550 meters) they were exploratory in nature and extracted only a small portion of the mineralized structures. Historic literature references these workings as continuing 900 feet (274 meters) at levels below ground level but these deeper levels were not accessed by WKM.
The underground workings and mineralization correlates well with surface channels and drilling by WKM. The shallow low-cost drilling by WKM did not cross-cut the whole zone as outlined below. Historic drilling that undercut the workings more fully provides good grade and position correlation.
|2018 Underground Composite 20' Rock Chips – Adit Area|
|Adit Level||Length (ft)||Length (m)||Au Grade (g/t)||Orientation|
|6347 Level||140||42.7||0.69||Across strike|
|6300 Level||160||48.8||0.86||Across strike|
|6300 Level||120||36.6||0.25||Across strike|
|6260 Level||120||36.6||0.14||Across strike|
|6260 Level||80||24.4||0.64||Across strike|
2018 Drill Program in the Adit Area
WKM completed four air-track (rotary air-blast type drill) holes in the Adit Area. This drilling method is inexpensive and was selected to gain a sense of vertical values where surface channel samples returned gold values of interest. Unfortunately the low-cost air-track drill was not able to drill deep enough to effectively test this area, resulting in a number of holes ending in gold mineralization. The holes that were achieved provided results with grades similar to the company’s Mineral Reserves in the region and demonstrated potential consistent with the underground and surface sampling.
One hole had results that indicated it was beyond the Adit Area gold-bearing structures.
|2018 INTERCEPTS – ADIT AREA|
|GM18RB-AA02||60||18.3||0.77||Surface||Surface||Full width of veins not tested||75||22.9|
|GM18RB-AA04||150||45.7||0.49||Surface||Surface||Bottomed in mineralisation||150||45.7|
|GM18RB-AA04A||30||9.1||0.40||Surface||Surface||Full width of veins not tested||35||10.7|
* GM18RB-AA01 drilled to 95' (29m) but encountered no significant intercepts
Future Exploration at Gold Mountain
Follow-up with a larger reverse-circulation drill. Three or four holes are required to fully assess the grade and width profile in the Adit Area. Detailed mapping and surface gold values provide a clear target area.
WKM has designed a follow-up drill program based on the positive results obtained, with a focus on adding to the 3D model in the Adit Area and along strike for open pit resources and reserves.
Gold Mountain Metallurgical Test Program
Crushed reject material remaining after recent assays from continuous surface sampling were tested for amenability for heap leaching by “Bottle Roll” tests at Kappes Cassiday & Associates, Reno. The material is well oxidized and fractured and these initial tests indicated that it should leach as well as ore from Hasbrouck Mine. Further metallurgical testwork is required to confirm this view.
Hasbrouck deposit Exploration
The Hasbrouck Deposit is a low-sulfidation, epithermal gold–silver deposit which is located in the western portion of the Divide Mining District. Hasbrouck Peak, which forms the core of the deposit, is composed primarily of tuffs and epiclastic sediments of the Siebert Formation, which is underlain by Fraction Tuff. Several occurrences of chalcedonic sinter, deposited during hot spring activity, exist at or near the top of the mountain. Gold and silver mineralization outcrops over much of the western half of Hasbrouck Peak.
The currently-known mineralization is approximately 1,900 ft east–west by 1,100 ft north–south and has been drill-tested to a depth greater than 900 ft. Mineralization is open to the north and south at depth.
No exploration is currently planned at the Hasbrouck Deposit as this deposit is well-drilled with 331 boreholes in and around it. Modern exploration has been continuous since the 1970s and has adequately defines the Mineral Resources and Reserves.
Three Hills mine Exploration
The Three Hills Deposit is a low-sulfidation, epithermal gold deposit, with mineralization associated with structural features, rock-unit contacts, and with high-permeability lithology. Gold mineralization occurs in a zone of pervasive silicification within the Siebert Formation and the upper 10 to 30 feet of the Fraction Tuff. The contact between these two units contains consistently higher grades of gold and is commonly argillized. The current Mineral Resource extends 600 ft east–west by 2,000 ft north–south and has been drill-tested to a depth greater than 1,000 ft. Mineralization remains open to the east and at depth. The Company continues to explore this deposit.
In July-August of 2014, West Kirkland drilled four exploration holes on the eastern flank of the Three Hills deposit, testing a new structural interpretation of the deposit. The company has identified northwest structures as a potential host of high-grade mineralization. The company tested for zones of structural preparation near the contact between the Siebert formation and the Fraction Tuff.
|Three Hill plan map showing target structure and 2014 drill results||Three Hills facing west showing younger Brougher Dacite cap on the north hill which has eroded on the south hill, suggesting a fault zone|
Hole TH14R-004 returned 50.3 meters grading 0.73 g/t Au and 3.2 g/t Ag within a zone of intersecting structures and includes 9.2 meters at 2.27 g/t Au. Mineralization starts 26 meters above the contact between the Siebert and Fraction Tuff and continued 24 meters below the contact. This intercept is 70 meters northwest of hole TH12R-15, drilled by a previous owner, which returned 66 meters of 3.3 g/t Au in a similar setting at the same elevation.
A table of West Kirkland's 2014 Exploration drilling at Three Hills is presented below.
|Hole ID||From (m)||To (m)||Length (m)||Au (g/t)||Ag (g/t)|
*true thickness has been estimated by Company geologists to be approximately 70% of length
Hill of Gold Exploration
In late 2016, West Kirkland leased the Hill of Gold deposit with an option to acquire a 100% interest. Hill of Gold is located equidistant between the Three Hills and Hasbrouck deposits and is now being explored as a possible additional source of ore for processing on the heap leach at the fully-permitted Three Hills Mine some three kilometers due north.
Historical metallurgical work at Hill of Gold indicates that mineralization is oxidized and amenable to heap leaching at 1.5 inch particle size with 80% gold recovery. The host rocks and geological setting at Hill of Gold are very similar to the Three Hills deposit.
Drilling performed in 1993 at Hill of Gold is in the same area that the Company targets for follow-up drilling, and includes Hole 93-63 which intercepted 32 meters of 0.5 g/t gold at 58 meters below collar, and Hole 93-61 which intercepted 41 meters of 1 g/t gold at 70 meters below collar. Drilling in this area in 1996 included Hole HG96-5 which intercepted 29 meters of 1.2 g/t gold at 55 meters below collar and Hole HGC96-6 which intercepted 17 meters of 2.9 g/t gold at 59 meters below collar. Modelling by West Kirkland suggests that these intercepts are open for further expansion at a shallow enough depth to allow open pit mining.
West Kirkland drilled one hole at Hill of Gold in early 2017 which successfully expanded the gold zone previously defined by the historical 29,926 feet of drilling which involving 83 reverse circulation holes and 6 core holes:-
|Hole No.||From (m)||To (m)||Length (m)||Au (g/t)||Ag (g/t)||AuEq (g/t)|
|HILL OF GOLD||HOG17-001||0.0||103.6||103.6||0.5||8.0||0.6|
AuEq grade is (gold grade) +( silver grade multiplied by $16.89 divided by $1,200)
Further drilling at Hill of Gold will be targeted up–dip towards surface from this initial gold bearing intercept.
Authors and Qualified Persons Statement
R. Michael Jones, CEO of West Kirkland Mining, and a qualified person as defined by NI 43-101, has reviewed and approved the foregoing technical information. He is the non-independent qualified person for the purpose of the information contained on this web page.
1 Technical Report and Updated Preliminary Feasibility Study for The Hasbrouck and Three Hills Gold-Silver Project, Esmeralda County, Nevada, USA, Report Date: September 14, 2016 (the “Technical Report”)