Crushed Rock Products
Polaris is currently advancing the development of its Black Bear Project, which is a large basalt deposit located adjacent to our sand at gravel resources near Port McNeill on northern Vancouver Island. In the coming years, this creates the opportunity to offer a number of crushed rock products for sale. Potential product offerings will include the following:
- 8" coastal shore revetment / road fill
- small and large gravel with a 100% fractured face count
- manufactured sand
Preliminary materials testing is supportive of the use of this material in a number of applications. Summary test results are below:
Test | Test purpose |
# of Samples |
Average Result |
Relevant Standard(1) | Test Reference |
Absorption | Mix design | 15 | 0.77% +/- 0.37% | n/a | ASTM C127 |
LA Abrasion for large coarse aggregates |
Hardness | 15 | 16.4% +/- 4.9% | <50% | ASTM C535 (500 Revs) |
Film Stripping | Asphalt adhesion |
3(2) | 0-10% | <25% | CT302 |
Relative Density | Mix design | 15 | 2.94 +/- 0.04 | n/a | ASTM C127 |
Magnesium Sulphate Soundness |
Durability | 15 | 1.9% +/- 3.7% | <15% | ASTM C88 |
Point Load | Strength | 15 | 158 +/- 57 MPa | n/a | Deere and Miller, 1966 |
Accelerated Mortar Bar |
Alkali Silica Reactivity | 3(2) | 0.05% | <0.1% | ASTM C1260 |
Neutralization Potential Ratio |
Acid Rock Drainage | 15 | 22.3 | >4 | Price et al., 1997b |
(1) Standards for construction aggregate performance other than Neutralization Potential Ratio, which is relevant to evaluation of the deposit for potential risk of acid rock drainage.
(2) Testing performed on composites of holes 02-16, 04-16 and 05-16.