Today is Sunday, May 19th;
After having downloaded the West Forty linedata, I spent Saturday, May 18th prospecting.
When I prospect, I go for the "easy money"...
Easy money is defined as the highest value targets found at the most shallow depth!
My first objective is to go through the entire survey, line by line looking for the LARGEST shallow anomaly...
I know, it sounds like "Rocket Science"... the Coplanar coils operating at 56K Hz measuring the inphase signal represent "Easy money". The signal is called "cpi56k". The response of the signal measured in parts per million is synonymous with the intensity of sound you get on a conventional metal detector. Prospectors are looking for the largest response!
When using the viewer, a prospector can select which data he/she wants to view. I choose the data that is relevant to my objective, easy money. I look at three data sets. The data sets are cpi56k, cpq56k and mag. Mag is the residual magnetic intensity (RMI). RMI is the best indicator of faulting and faulting is an indication of where the crust of the earth may have offered a conduit for hydrothermal fluids to escape to the surface including GOLD mineralization in the form of GOLD nuggets. I know it's complicated, but I'm not going to waste your time with baby talk.
The link at the opening post provides all of the information you need to GET ON THE GOLD.
CPI56K;
This signal provides the best response to "Reactive" mineralization in the shallow sub-surface. The "I" in CPI56K stands for "In-phase". The in-phase signal is a measure of "Reactivity". Enough about theory...
The survey lines start with line L10010 and progress trough line L10980. The line numbers increment by ten. We can see there were about 98 parallel survey lines that were flown. There are additional "tie lines" that are flown perpendicular to the survey lines to check for repeatability and measure any drift in the measuring system.
A precision GPS navigation system is used to measure the exact location of every station along each survey line. As mentioned in other posts on the subject, DIGHEM surveys make a measurement ten times per second while flying at about 90 miles per hour over the surface. That works out to a speed of 120 feet per second and a measurement every 12 feet. Data is collected and the GPS coordinates simultaneously recorded in an on board computer. That data forms the linedata data base.
West Forty;
The survey begins at the southern end of the survey area and lines are flown in alternating directions along a northwest - southeast direction and progressing toward the north east with 1/4 mile spacing.
Initially there isn't much happening. Like conventional metal detecting, the earth is mostly void of anything that would be of interest...
I'n looking for the largest CPI56K signal response... Most of the responses are less than 200 to 300 ppm. A good response is in the realm of 500 to 1000. I consider 1000 to be worth digging...
- Geowizard
