The potential environmental impacts related to the use of water and the disposal of waste from camp operation and drilling are as follows:
•Water for the camp water supply is derived from George Lake, which has sufficient capacity
•Camp waste is incinerated or removed from site
•Greywater is discharged to a wetland with a long flow path to and unnamed lake
•Drills and drilling supplies are positioned using helicopters to minimize ground disturbance when the ground is unfrozen.
•When drilling on land, salt (calcium chloride) is added to drill water to keep the drill rods from freezing in the hole.
•Brine is not required for drilling on the ice into the bottom of larger lakes as these lakes are not underlain with permafrost.
•Water from drilling operations is recirculated to minimize the quantity of both water and salt used and to minimize runoff near the drill site.
•Drill cuttings are collected and subsequently deposited in a sump
•Drilling in lake bottoms occurs within a casing to minimize sedimentation.
•At each drill site (except those drilled from ice) drillholes are backfilled with cuttings and cement or bentonite.
Cumulative impacts of drilling are minimized because of the above mitigation measures, as well as progressive reclamation (backfilling) of drill holes. Sabina notes that past inspection reports by the CIRNAC Water Resources Inspector have commended Sabina on the handling of wastes and drill hole reclamation.
||offsite disposal of ash
||Incineration or open burning
||grease trap and discharged to a wetland with a long flow path to an unnamed lake
||backhauled to Yellowknife for disposal in an authorized facility
||empty drums are drained and crushed
||backhauled off site for disposal in an authorized facility
|Sewage (human waste)
||incinerator ash is disposed of off-site
||Pacto toilet waste in bags which are collected and incinerated