Johnson Tract Project

(100% of the Johnson Tract project has been spun out into HighGold Mining as of July 31, 2019)

Exceptional high-grade gold asset with no modern exploration since the mid 1990s

The Johnson Tract Project is an advanced stage poly-metallic (gold, sliver, zinc, copper, lead) project located near tidewater in Southcentral Alaska with excellent exploration potential over a 12-kilometre strike length

The Johnson Tract drill discovery, made by Anaconda Minerals in 1982, reported 102.6 meters grading 10.94 g/t gold, 8.01% zinc, 0.75% copper, 2.13% lead and 8.5 g/t silver, including 50 meters grading 20.0 g/t gold, 9.4% zinc, 1.0% copper, 2.8% lead and 12.7 g/t silver.

Constantine signed a letter of agreement in June 2018 with the Cook Inlet Region, Inc. (CIRI), an Alaska Native Corporation, for the lease rights to 8,475 hectares (20,942 acres) to Constantine, including the Johnson Tract deposit. For more detailed information on the Johnson Tract Agreement, see Constantine press release dated May 21, 2019. For detail on the results of a re-sampling program, see Constantine press release dated June 28, 2019.


Location Southcentral Alaska, USA
Ownership 100% CIRI - Constantine letter of agreement signed for 10-year lease.
Status Active - Exploration program underway
Deposit Type Volcanogenic Massive Sulphide
Property Size 8,475 hectares (20,942 acres)
Host Rock Volcaniclastic
Age Jurassic; similar age as Eskay Creek Au-Ag-Cu-Pb-Zn Mine
Main Economic Elements Gold and Zinc, with Copper, Lead and Silver credits
Approximate Geometry Quartz vein stockwork
Mineral Resource Non-compliant historic resource
Proposed Mine Design Underground

Location Map

Signficant intersections


  • Large property position totaling approximately 8,475 hectares (20,942 acres) consists of two parts:
    1. a 11,342-acre (4,590 hectares) fee simple land package (South Tract) that hosts the known deposit, and
    2. the 9,600-acre (3,885 hectares) North Tract consisting of mineral rights only with several known high-grade prospects.
  • The Johnson Tract project is an inholding in Lake Clark National Park and was conveyed to CIRI under the terms of the Alaskan Native Claims Settlement Act (ANSCA) and the Cook Inlet Land Exchange. Ratified by an act of Congress and approved by the Alaska Legislature in 1976, CIRI is entitled to mutually agreed upon transportation and port easements through Park lands for mineral extraction.
  • Property includes the very high-grade Johnson Tract Au-Ag-Zn-Cu-Pb deposit along with excellent exploration potential indicated by several other prospects over a 12 km strike length.
  • Excellent access - located near tidewater in Southcentral Alaska.

Updated Johnson Tract Technical Report

Constantine completed an updated technical report titled “NI 43-101 Technical Report for the Johnson Tract Project” dated June 27, 2019, done by Brodie Sutherland, P.Geo, who is an independent “qualified person” under National Instrument 43-101 - Standards of Disclosure for Mineral Projects. The report was prepared for Constantine’s wholly owned subsidiary, HighGold. for the complete report.

The report presents new assay results from a drill core re-sampling program completed in late 2018. The objective of the program was to confirm the location and grades of historic mineralization documented in drilling completed between 1982 and 1993. A total of 426 samples were taken across nine (9) drill holes and submitted to ALS Chemex laboratories in Vancouver, BC. Samples were of quarter-cut drill core taken from previously sampled intervals archived on site in secure storage. Table 1 is a comparison between historic data and a sub-section of the 2018 resampled drill holes reported in the NI43-101 Johnson Tract Technical Report referenced above. The data show a strong correlation between the historic and 2018 duplicates, for all the precious and base metals of interest.

Table 1. Comparison of some 2018 resampled core drill intervals to historic results

Drill Hole Sample
JM-82-003 Historic 196 219 23 1.63 15.33 0.94 2.46 12.12
JM-82-003 Re-sample 196 219 23 1.17 16.66 1.04 2.54 11.00
JM-82-003 Historic 223 246 23 2.21 6.43 0.16 0.10 2.38
JM-82-003 Re-sample 223 246 23 2.42 7.05 0.18 0.13 2.77
JM-88-034 Historic 246.7 318.1 71.4 20.94 5.21 1.23 1.51 9.81
JM-88-034 Re-sample 246.7 318.1 71.4 20.70 4.85 0.88 1.28 8.16
JM-93-064 Historic 263.7 297.5 33.8 9.00 3.48 1.26 1.08 7.76
JM-93-064 Re-sample 263.7 297.5 33.8 6.94 3.71 1.39 0.85 7.83

* All intervals shown as apparent width, true width 60% to 90% of drilled widths

The technical report concludes that the potential for discovery of additional mineralization at the Johnson Tract Project is considered very good. The most immediate opportunity is the Northeast Offset Target, interpreted as the fault displaced extension of the deposit. Limited historic drilling at this target has documented alteration and mineralization that shares the same characteristics of the main Johnson Tract deposit. Additional exploration drilling is clearly warranted.

Multi-deposit, district-scale potential is supported by the presence of other mineral prospects, most notably the Difficult Creek prospect where similar tenor mineralization to the Johnson Tract deposit is documented. A total of 1,344 meters of drilling were completed at Difficult Creek by a former operator in 1983, outlining a large alteration system and up to 36.6 meters of 3.57 g/t gold, 1.8% zinc, 0.2% copper, 0.4% lead and 15.5 g/t silver in drill hole DC83-002. Additional drilling is recommended. Other prospects such as Easy Creek, Kona and South Valley show promising surface results and require further field work to establish drill targets.


  • The Johnson Tract drill discovery made by Anaconda in 1982 reported 102.6 meters grading 10.94 g/t gold, 8.01% zinc, 0.75% copper, 2.13% lead and 8.5 g/t silver, including 50 meters grading 20.0 g/t gold, 9.4% zinc, 1.0% copper, 2.8% lead and 12.7 g/t silver.
  • Past work includes eighty-eight (88) drill holes for a total of 26,840 meters, and major engineering and mining related studies by Westmin Resources Ltd. that evaluated direct shipping ore to their Premier mill in Stewart BC*. The Project reverted to CIRI in the late 1990s and has seen no work to date since that time.
  • Metallurgical testing on drill core samples has generally indicated that good gold and base metal recoveries and marketable concentrates can be expected.

*Property Prefeasibility Technical Report, Johnson River Project, Alaska USA, March 1994. Internal company report prepared by Westmin Resources Ltd.


  • The Johnson Tract deposit is a gold and base metal-rich quartz vein stockwork in Jurassic-aged volcaniclastic rocks. Mineralization is interpreted as having formed in a sub-sea floor setting contemporaneous with the host stratigraphy – a similar environment to the well-known precious and base metal-rich Eskay Creek deposit.
  • There are at least nine other prospect areas of alteration and mineralization to the southeast and north of the Johnson Tract deposit over an approximate 12-kilometer strike length, most of which have seen little or no drilling.
  • Best known is the Difficult Creek prospect area that consists of several surface showings about 4.5 kilometers northeast of the Johnson Tract deposit. One of the Difficult Creek prospects that was drill tested returned significant values in two holes: DC-001 returned 3 meters of 7.54 g/t gold, 3.72% zinc, 0.11% copper, 1.15% lead and 27.4 g/t silver; DC-02 returned 13.0 meters of 8.57 g/t gold, 4.7% zinc, 0.5% copper, 0.9% lead and 37.7 g/t silver.



plans are being formulated for future exploration drill programs to confirm historic results on the Johnson deposit and test the projects significant exploration potential

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