Black Lake Property

The Black Lake Project (“Black Lake”, or the “Project”) is located in the northeastern Athabasca Basin approximately 15 kilometres south of the hamlet of Stony Rapids, Saskatchewan. The Project lies adjacent to ALX’s Gibbons Creek project with all-weather road access and nearby infrastructure, including a commercial airport. Regionally, deposits and prospects such as Fond du Lac, Middle Lake and the historic Nisto Mine, all located within 80 kilometres of the Project, have demonstrated the potential for unconformity-style uranium mineralization in the area. Historical exploration by UEX Corporation (“UEX”) intersected unconformity-style mineralization in several areas on the Project, and ALX views Black Lake as prospective for the discovery of an economic uranium deposit.

In summary, drilling by UEX at Black Lake to date has intersected unconformity-style mineralization in the northern Black Lake property along a strike length of more than 1.7 kilometres along and adjacent to the Eastern Fault Zone of the Platt Creek Fault system. Mineralization comprises (i) unconformity-style mineralization straddling the unconformity in the footwall of the Eastern Fault Zone, and (ii) mineralization directly along the fault where it intersects the unconformity, with best intercepts developed where a small basement wedge is present.

2017 Exploration Plans

Previous exploration at Black Lake has successfully identified uranium mineralization of the unconformity type, although no discrete deposits have yet been defined. Future exploration activities will assess the potential of known intercepts, as well as drill testing of other portions of the over 24-km strike length of the Platt Creek Fault zone/conductor on the property. Similar to other areas of the Athabasca Basin, the style of mineralization intersected to date indicates that nearby mineralized zones may be present at Black Lake.

ALX has received an exploration permit for Black Lake and is currently planning an airborne geophysical survey and an initial diamond drilling program of approximately 2,500 metres in up to 6 holes. The Company believes that its integration of leading edge exploration technology with an updated geological interpretation, including the recognition of cross-cutting structures and “off-conductor” drill targets, could vector ALX toward a new discovery at Black Lake. Potential for uranium mineralization may exist “down-dip” along the known conductive structures in the basement rocks which remain untested. Previous explorers focused on the “up-dip” expression of uranium mineralization at the unconformity between the overlying sandstone and the basement rocks.


In 2004, UEX intersected a significant intersection of uranium mineralization in drill hole BL-18 (0.69% U3O8 over 4.4 metres, including 1.09% U3O8 over 1.5 metres) which sparked an extensive amount of exploration work in the northern Athabasca Basin by UEX and other uranium exploration companies. Other mineralized holes were drilled at Black Lake over the next several years (see Table 1 below), but despite the series of uranium occurrences, no new uranium deposit was discovered.

Table 1. Black Lake Historical Mineralized Uranium Intersections

Hole No. Year Grade (% U3O8 ) From (metres) To (metres) Interval (metres)
BL-018 2004 0.69 310.50 314.90 4.40
1.09 312.80 314.30 1.50
BL-023 2005 0.28 307.90 308.00 0.10
BL-032 2005 0.16 313.90 315.30 1.40
BL-056 2005 0.26 319.90 322.50 2.60
BL-064 2005 0.54 338.75 340.75 2.00
BL-082 2006 0.50 273.45 276.75 3.30
1.60 274.45 275.15 0.70
BL-110 2006 0.79 309.73 312.55 2.82
1.57 311.25 312.55 1.30
BL-137 2007 0.24 275.40 278.40 3.00
BL-140 2007 0.67 274.10 277.10 3.00
1.58 274.40 275.40 1.00

The mineralized intervals listed in Table 1 were encountered at the unconformity between the overlying Athabasca sandstones and underlying basement rocks at downhole depths between 274.10 and 340.75 metres. Historical work in the northern part of the Project has demonstrated the potential for a polymetallic mineralizing system in relatively shallow sandstone cover that ranges from approximately 225 to 300 metres. A predecessor company of UEX re-sampled historical drill hole RL-4B drilled by Eldorado Uranium in 1980, which returned values of 171.6 parts per million (“ppm”) uranium, 0.207% cobalt and 256 ppm nickel over 0.75 metres from 251.00 to 251.75 metres in basement rocks, approximately 25 metres below the unconformity

Property Description, Location and Ownership

  • Northeastern portion of the Athabasca Basin near Stony Rapids, SK
  • Black Lake consists of twelve claims totaling 30,381 hectares (75,073 acres)
  • Black Lake is currently held as a joint venture between UEX and AREVA Resources Canada Inc. (“AREVA”). As of June 30, 2017, Black Lake was held 90.92% by UEX and 9.08% by AREVA
  • ALX can earn up to a 75% participating interest in the joint venture from UEX by issuing up to 12.0 million common shares to UEX and spending up to $6.0 million on exploration over an approximate 4-year period
  • ALX will act as operator of exploration at Black Lake

Geological Setting

Black Lake is staked over the Platt Creek Fault, a major NNE-trending fault parallel to the Black Lake Fault. Shear zones and faults of this style are frequently host to unconformity-type uranium deposits in the Athabasca Basin. The Project is underlain by 250 to 600 metres of Proterozoic sandstone of the Athabasca Group that dips shallowly to the south. The sandstone unconformably overlies Archean-aged basement rocks of the Tantato Domain, which comprise metavolcanic units, graphite-bearing metasedimentary gneiss, mafic sills and granites that have been affected by amphibolite to granulite facies metamorphism. Basement rocks trend mainly northeast, and are affected by tight, megascopic folds. Post-Athabasca faults also strike mainly to the northeast, and include the Platt Creek Fault, which extends through the project area northward into older syn-metamorphic shear zones.

Exploration to date has been principally directed towards the testing of a southeast-dipping reverse fault, termed the “Eastern Fault”, a subparallel strand of the Platt Creek Fault system, and associated graphitic gneiss units which are defined by electromagnetic (“EM”) conductors. Competency contrast between soft chloritized amphibolites or graphitic pelites and the siliceous leucocratic granitic gneiss favours the development of ductile to brittle shear zones. Reactivation of these shears may result in post-sandstone faulting. Locally multiple stages of post-sandstone faulting or branching of the same fault have resulted in more widespread fracturing and desilicification of sandstone and clay alteration of basement rocks along the fault in the vicinity of the unconformity, conditions prospective for uranium deposits. Dravite (Mg-tourmaline), siderite and less commonly pyrite veining are present in the sandstone column particularly in the northern Black Lake property, which are alteration assemblages that are often spatially associated with uranium mineralization.

History of Exploration

Black Lake was initially explored in the 1970s following the discovery of radioactive boulders identified in till. EM surveys carried out initially by Eldorado Nuclear Ltd. during 1979 to 1980, and then subsequently by Cameco Corporation in 2000, identified well-defined north-northeast trending conductors now known to be associated with the Platt Creek Fault and its principal eastern strand along the east side of the conductive package, the Eastern Fault Zone.

After evaluating drill core from previous operators which intersected above background, low-grade mineralization near the unconformity, and on the basis of the strength of the Platt Creek Fault conductors, UEX commenced systematic testing for uranium mineralization on the Black Lake property in 2003.

During the 2004 summer program, hole BL-18 encountered unconformity-type uranium mineralization at a vertical depth of 310.5 metres grading 0.69% U3O8 over 4.4 metres between 310.5 and 314.9 metres, including 1.09% U3O8 over 1.5 metres between 312.8 and 314.3 metres. The mineralization occurs at the base of the Athabasca sandstone column straddling the unconformity. Also associated with the BL-18 intercept are highly anomalous concentrations of arsenic, copper, lead and nickel, which are typically associated with unconformity-style mineralization in other parts of the Athabasca Basin. On the basis of the BL-18 intersection, UEX increased its exploration activities in the project area, testing the Eastern Fault Zone and associated graphitic package primarily in the northern portion of the Black Lake property.

Subsequent drilling in 2005 and 2006 intersected additional uranium mineralization adjacent to the BL-18 intercepts, defining a flat-lying pod of mineralization over several tens of metres which is developed along the unconformity in the footwall of the Eastern Fault Zone. In addition, significant uranium mineralization was encountered in two holes along the Eastern Fault Zone at, or immediately below, the Athabasca unconformity. In hole BL-56, located approximately 200 metres south of hole BL-18, mineralization was intersected from 319.9 to 322.5 metres, grading 0.26% U3O8 over 2.9 metres. Hole BL-64, located approximately 600 metres south of BL‑18, intersected unconformity-style uranium mineralization, similar to that found in hole BL-18, from 338.75 to 340.75 metres, grading 0.54% U3O8 over 2.0 metres.

Several holes drilled in 2006 and 2007 along the Eastern Fault Zone intersected a small overthrust wedge of graphitic gneiss on Athabasca sandstone associated with a major reverse fault where uranium mineralization is developed. In the Athabasca Basin, the presence of such a basement “wedge” is considered an important geological feature for potential uranium deposition, having formed a structural trap for mineralizing hydrothermal fluids. The uranium mineralization in these drill holes occurs along and immediately beneath the wedge where the Eastern Fault Zone intersects the Athabasca unconformity. Drilling intercepts in this area include 0.50% U3O8 over 3.3 metres from 273.45 to 276.75 metres, including 1.60% U3O8 over 0.7 metres in drill hole BL-082, 0.24% U3O8 over 3.0 metres from 275.4 to 278.4 metres, including 0.56% U3O8 over 1.0 metres in drill hole BL-137, and 0.67% U3O8 over 3.0 metres from 274.1 to 277.1 metres, including 1.58% U3O8 over 1.0 metre in drill hole BL-140.