The equivalent uranium values are based on down-hole radiometric gamma logging
carried out by a fully calibrated Aus-Log gamma logging
The present study was based on lithostratigraphic and gamma logging
data (NGAM) collected by APCO about 16 boreholes.
Several mineralized intercepts have been made on the Bella Rose Fault Zone at Bella Rose and Mt Osborne South, where assays are pending but gamma logging
has shown a number of significant anomalies.
The first field station included a geophysical demonstration by the Indiana Geological Survey of downhole gamma logging
(in a PVC cased well) and surface resistivity arrays.
Down-hole gamma logging
relies on detecting the daughter products of uranium, Bi214 and Pb214.
The drilling will collect core samples of the potash horizons and is likely to confirm the presence of potash which has previously been detected by gamma logging
of petroleum wells.
Confirmatory samples will also be collected and sent for assay from anomalous zones defined by the gamma logging
. Results will be reported during the next 4 to 6 weeks.
Drilling commenced with four RC rigs on 19 May 2011, with immediate encouragement from chip logging and downhole gamma logging
returning high eU3O8 results.
A number of mineralised holes which also had high-grade downhole gamma logging
results are still in the process of being assayed.
Details of sample location control for PNC and Manhattan's drilling, down hole surveying and recovery, PNC and Manhattan's data, gamma logging
, radiometric determination of U3O8, secular disequilibrium and chemical assay equivalent cU3O8, the relationships between radiometric and assay sample support effects and disequilibrium, processing of PNC's gamma logs to produce eU3O8, processing of Manhattan's gamma logs to produce eU3O8 and bulk density are addressed by Hellman & Schofield and provided to Manhattan in their confidential report.