CLOSED: Request for Proposals: SeArch Project Airborne Magnetic Surveys



Geoscience BC is pleased to issue this Request for Proposals (RFP) for two airborne magnetic surveys, to be flown as part of the SeArch Project.

The SeArch Project aims to stimulate new mineral exploration activity and to enhance the success of existing exploration activities in central British Columbia. This project has been designed to develop a better understanding of the mineral potential of the area, by collecting new geophysical and geochemical data, and integrating the results into new geoscience products.

Geoscience BC is now seeking proponents to undertake two separate airborne magnetic geophysical surveys over the SeArch project area (Blocks 1 North and South respectively). Proponents must submit separate proposals for Blocks 1 North and South.

For more details on this RFP and proposal specifications, please download the following:

Proposals should be submitted by email no later than 12 pm (Pacific) on Monday, July 13, 2015. All questions and communication should be directed via email to Christa Pellett, Project Manager, Geoscience BC.

SeARCH Airborne Magnetic Survey

Frequently Asked Questions - updated June 30, 2015

Q. Please confirm that a noise envelope of less than 0.1 nT is acceptable to Geoscience BC.

A.A noise envelope equal to or less than 0.1nT is required.

Q. Is the calculated drape surface a mandatory part of the proposal?.

A.No. Proposals submitted will be considered on their merit. A proposal to fly without precalculating a drape surface should address the issues of maintaining a smooth drape and discuss in detail QC processes that will be used to check the quality of the data. The correction of misfits and corrugations in the data will be of particular interest, along with tie-line fits. Note that all processing corrections applied to adjust raw data acquired on the aircraft to the final corrected Residual Magnetic Field must be documented, and shown individually in the final digital data archive.

Q. Airborne data quality and survey production (and therefore cost) are related to consistency of terrain draping. What will be your acceptance criteria for variations from the 80 m AGL specification? Is it just the <30 m tie-line fits?

A.The 80 m AGL specification is the safe terrain clearance specified. In regions of steep topography, it is not practical to safely fly a smooth drape and to maintain 8 0m AGL. If the digital terrain model is subtracted from the precalculated smooth drape surface, then the expected terrain clearance can be predicted across the survey area. The RFP requires that the altitude of the survey aircraft be maintained within 15 m of the preplanned drape. If both a survey traverse and a tie-line altitude are 15m out of specification and in opposite directions, then the tie-line misfit will be 30 m. The tie-line misfit is not related to the survey height above ground. Note that a ground clearance of less than 80 m will be considered out of specification and inappropriate for the line spacing of 250 m.

Q. What is the maximum Figure of Merit that will be acceptable for compensation flights?

A.The contractor should estimate the Figure of Merit that they will achieve.