A study of subaqueous disposal of reactive tailings started in 1988 with an initial overview of all known Canadian sites. A work plan was developed in 1989, which consisted of evaluating four lakes (Suttle and Benson Lakes, BC, Anderson and Mandy Lakes, MB) over 2-year periods for each lake. The initial yearconsisted of evaluating the biophysical features of each lake as a preliminary exercise in preparation for the second year of work. The second year consisted of performing detailed geochemical work on interstitial water at two or three sites in each lake. Each phase resulted in the preparation of a separate report.At the request of MEND, a scientific and technical peer review of all work was done in 1992. This and presentations made to regulatory agencies provided feedback on the merits of use of subaqueous disposal to control reactive materials. Information deficiencies were also documented. Additional research work was undertaken to address these and support application of this method. A planning team of technical and scientific experts met in January 1993 and outlined a program which incorporated the peer review recommendations. Two lakes were selected to continue the field program and work has been undertaken to obtain additional data. Companion studies include technical literature reviews, comparison of field techniques, and the establishment of quality assurance and quality control programs.A planned outcome is a manual on how to employ the technique for final disposal of reactive tailings.

The fractionation of oxygen isotopes between sea ice and sea water in samples collected from the Gulf of St. Lawrence indicated that sea ice is enriched in its O18:O16 ratio with respect to coexisting sea water. Sources of sea ice in the Gulf of St. Lawrence may be identified on the basis of O18:O16 measurements.

No abstract

No abstract

No abstract