Mining company reports often mention geophysics programmes and the terminology is usually not explained. I have listed common techniques and attempted to explain each simply. The most important thing to remember is that none of these techniques identify the location, grade or volume of mineralisation. Rather, geophysics identifies a likely location for mineralisation for the geologist to examine further. Any geophysical target should be initially followed up by boots on ground geology (even targets beneath cover).
If you are planning to invest in a mining company you might be interested in Snowden’s Principal Consultant, Jeremy Peters, insights as to contractor vs owner operator, read his article ‘Contractor vs owner operator – the price of everything and the value of nothing?’ here.