Study on the Matsuo Deposits, from the Geological Prospecting Point of View(II)

Results of Geological Survey and Conclusions

Abstract

In Part I of this report, general conclusions were derived from the results of the geological survey and data of deep boring. The processes of formation of the deposits were explained and important previously unknown geological information concerning the prospecting in the ore body were obtained.
The main results are as follows:
(1) The shales accomplished the role of cap rock for the ore deposits.
(2) Fissures have no relation to the location of the ore shoot, there is no use tracing fissures in prospecting.
(3) It is not very important to trace stratigraphic structures of country rocks in prospecting.
(4) In the Matsuo mine, the determination of the position of a diffusion center from which the mineralizers emanated is most important.
(5) The form and location of the deposits depend upon the position of the diffusion center, and also upon the chemical and physical properties of the mineralizer.
(6) The deposits are assumed to be in the area bounded by a hanging wall having the shape of an oblate dome with the diffusion center as a locus and a foot wall parallel to the erosion surface on the underlying lava.
Therefore determination of the assumed limits of the ore body by the above principles is desirable before exploration by deep boring or drifting is undertaken.