the full reference is at the following site: http://pubs.usgs.gov/of/1995/ofr-95-0831/CHAP22.pdf
The comments in the annoucement show that even if there are some errors in timelines etc the team do know their geo...or certainly know what great signs are! The following is an extract from the http:// provided above. I will certainly be holding, if not topping up (to the limited capacity that I have).
Exploration geophysics Magnetite-rich systems can be readily recognized by aeromagnetic or ground magnetic surveys although surrounding country rocks that contain significant amounts of magnetite may complicate interpretation (for example, Kiruna area). Magnetite-dominated deposits in Missouri, for example, are associated with high-amplitude positive magnetic anomalies (Kisvarsanyi, 1981). Hematite-rich systems may have little magnetic expression. However, because both magnetite and hematite enriched rocks are much more dense than host rocks, they may be detectable by gravity surveys. Large deposits may be located on major lineaments that can be detected on satellite imagery. The unexposed Olympic Dam deposit, for example, was partly discovered because of its association with coincident positive gravity and magnetic anomalies and location on a major photolineament (Hoover and Cordell, 1992). Deposits that have high sulfide mineral content can be detected by electrical methods. Alteration zones associated with many deposits have been recrystallized during metamorphism so that they are not readily identifiable by geophysical methods.
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