Karst and Regional Groundwater Dynamics at Pine Point MVT Lead-Zinc Deposits, NWT, Canada|
Proceedings, IAH/CGS International Symposium on Regional Groundwater Flow: Theory, Applications and Future Development
Xi'an, China, June 22-23, 2013
© 2013, WDA Consultants Inc.
The genesis of MVT ore deposits, like those at Pine Point Mines in Canada, has been the subject of debate
for many years. The consensus is that the ore bodies were caused by hydrothermal saline water far in the
geological past from the Middle Devonian age to the Tertiary age. Garven  pointed out, however, that
‘from a hydrologic perspective, ore genesis could have taken place at any period in which gravity-driven flow
systems were operative.’ Presently those gravity-driven flow systems are in place. Understanding their
groundwater dynamics could put in context some of the previously established Pine Point ore genesis
hypotheses. It is generally said that, based on isotope and fluid inclusion data, the temperature of the ore
forming fluid in the Pine Point area must have been hydrothermal in a temperature range approaching 100 °C
or more. The average homogenized temperature in fluid inclusions in dolomite in the area is 116 °C and the
burial temperature about 70 °C according to Qing .