All geophysical survey data, be it ground or airborne, contains errors. The objective of quality control is to ensure that the usability of the survey results is not impacted by these errors and that the data noise remains below set thresholds.
When we help our clients plan drilling programs one of the first things we do is assist the client with preparing a tender document that we typically send to at least three drilling companies. Prices vary greatly and the cheapest offer is not always the best deal for our client. We evaluate the proposals we receive from the drillers to ensure our clients get what they need. We make sure that we select a drill rig that is fit for the purpose; for example, we would not require a rig with a capacity to drill 2,000 m deep holes for a program that consist of drill holes of a depth of up to 200 m. In such a case, we would rather choose a lighter rig with a smaller environmental footprint.
Airborne surveys are used predominantly for exploration of ore minerals, but can also be applied for fossil fuels and geothermal exploration, and in various engineering, land management and mapping projects. The technique measures physical parameters such as: rock density contrasts (gravity gradiometry), electrical conductivity (electromagnetic systems), radioelement concentration (Gamma-spectrometry), and percentage of magnetite (magnetics).
Lately, you may have heard about ‘machine learning’ or ‘artificial intelligence’ with respect to applying it to mineral exploration projects.
The reality is, we are overrun with datasets: drillhole data, petrophysics, airborne geophysics, ground geophysics, inversions, sampling data, structures, mineral chemistry, mapping and many other types of field data. We can get these datasets digitized and displayed in 3D, which ten years ago was still rather uncommon, but then what? There is only so much that the human eye can process visually.
Where to Start
The fabric, method of acquisition and management of unpatented mining claims in Ontario is about to change.
Are you ready?
The traditionally manual system of ground and paper staking and managing unpatented mining claims in Ontario will be replaced with an innovative online Mining Lands Administration System referred to as “MLAS”. Upon “conversion” to the online system, all active unpatented claims will be converted from their place on the land being legally defined by claim posts on the ground or by township survey to being legally defined by their cell and coordinate location on the provincial grid in CLAIMaps.
At this time of the year, many companies start their summer geological field programs, whether it be prospecting, trenching and rock sampling, soil sampling or drilling. With the pressures of day to day work, geologists may feel like there isn’t enough time to properly plan and prepare a field program, however this task should not be skipped or brushed over.
We're very pleased to introduce you to another talented member of our team - Brenda Sharp, Senior Geophysicist at Ronacher McKenzie Geoscience. Brenda shares with us a little background on her early career influences, and some experiences working in Australia and Canada, in this meet the team post.
Tie lines or Control lines have always been used for the levelling of magnetic data, but essentially ignored with respect to other geophysical methods. How about using them, not in the traditional sense, but as a guideline to the overall sense of the regional gradient of a survey? Although the examples to follow are EM, this can equally be applied to other methods.
Each year in May, the PDAC organizes the Student Industry Mineral Exploration Workshop (“SIMEW”), a two-week workshop for about 25 of the best geology students from universities and colleges in Canada. The goal of the workshop is to expose students to all aspects of the mineral exploration industry, and in particular those areas that may not be part of an undergraduate curriculum.
On April 20th, 2017, I was honoured to speak to the University of Toronto Earth Science graduating class at the "Earth Ring" ceremony.
The Earth Science Ring Ceremony was started at the University of Alberta in 1975, and has been adopted by other academic instituations across Canada. It's a ritual of welcome into the profession for newly qualified geologists and geophysicists. Each graduating student is presented with a ring, marked with the cossed hammer of geology and with the seismic trace of geophysics. It symbolizes the commitment and responsibility that comes with the geoscience profession.