Oroco Resource Corp V.OCO

RE:RE:RE:RE:RE:OROCO COMPLETES AIRBORNE MANETICS SURVEY AND UPDATES 3D IP

[GeneralGogol]

I have been reading up on what can be learned through the use of geomagnetic surveys. Here is some interesting weekend reading material.

“Mineralisation in porphyry Cu-Au deposits is commonly associated with magnetite that can produce strong discrete magnetic anomalies. This is usually within a zone of magnetite-destructive alteration that can be identified with a high resolution magnetic survey. Magnetic surveys are also useful in defining regional structure and geology in the porphyry environment.”

“In high sulphidation epithermal systems gold is commonly associated with massive silica alteration. This alteration results in resistivities in the order of thousands of ohm-meters compared with background resistivities of tens of ohm-meters in argillic and propylitic alteration. Both ground resistivity and airborne EM surveys have been successful in locating and defining these deposits. Alteration in high sulphidation epithermal deposits is magnetite destructive over a large area, although it does not appear to have a large vertical extent as the subdued character of the underlying lithologies can be observed.”

“High resolution magnetics and electrical surveys are the most useful geophysical techniques in exploration for porphyry and epithermal deposits. Airborne magnetic and EM surveys are fast and cost effective, particularly in areas of rugged topography.”

https://eprints.utas.edu.au/12469/1/front-hoschke-thesis.pdf

“Porphyry-style mineralisation often appears as near circular anomalies within magnetic data...Image analysis provides an objective and efficient means to automatically enhance and identify responses associated with mineralised environments within large magnetic datasets. For example, magnetic anomalies, caused by alteration, with specific shape characteristics can be sought within the data using a shape-based feature detection technique. In this article, we present an image analysis system based on circular feature detection for rapidly locating magnetic signatures typical of porphyry copper-gold systems.”

https://www.researchgate.net/publication/331060244_Automated_identification_of_magnetic_responses_from_porphyry_systems

Here is a recent example of another company utilizing a heliborne magnetic survey technique to better define their copper-gold porphyry deposit.

https://www.accesswire.com/620963/Pershing-Resources-Receives-Initial-Review-of-Airborne-Magnetic-Survey-Data-for-Its-New-Enterprise-Porphyry-Copper-Gold-Project

I found many other industry examples online. So these survey techniques have been employed for quite some time. I indicated in a previous post that the surveys can be used to identify the presence of magnetite (but we're not drilling for magnetite of course). However, as indicated in the published research above, discovering the lack of magnetite in certain areas can be be very valuable information. With the size of the Santo Tomas concession, it makes sense that the heliborne surveys were carried out.