Advantage Lithium has provided this update on the sampling of diamond core hole CAU16 in the previously undrilled NW Sector of the Cauchari JV property located in Jujuy Province, Argentina.
- Systematic brine sampling is now complete in hole CAU16 which intersected permeable sandy sediments that are expected to yield relatively high pumping rates
- The brine body extends over >284 m vertically, including a high grade central interval also intersected in CAU07
- The CAU16 high grade brine interval averages 529 mg/l Lithium and 4,306 mg/l Potassium from 118-199 m depth, including four samples averaging 619 mg/l Lithium from 169 to 199 m
- Low Mg/Li ratio of 2.5:1, similar to CAU07 and the Olaroz and Cauchari projects – excellent for conventional brine processing
- Diamond drilling continues on hole CAU15, currently at 205 m, 6.5 km south of CAU16, encountering intervals of sand in the hole similar to CAU16 and CAU07
- Pumping tests commenced on wells installed in rotary holes CAU08 and CAU10
Vice President Project Development Andy Robb commented: "The results from the systematic sampling of CAU16 confirm the continuation of the brine body south from CAU07, while the presence of sandy sediments throughout the hole is very positive for brine extraction. We will continue drilling in the SE and NW sectors into 2018, having secured three drill rigs capable of completing our program to fully delineate the potential for high yielding sand zones. Now that the program is more advanced Frits Reidel of hydrogeological consultants FloSolutions will be acting as the nominated QP for the future reporting of exploration results, leading up to a new resource estimate. FloSolutions are currently providing independent oversight of drilling and sampling activities."
CAU16 Drilling Results
Sampling delineated a high-grade brine interval averaging 529 mg/l Lithium and 4,306 mg/l Potassium over 81 m within the larger brine body which extends vertically over at least 284 m (sampling was not completed to the base of the hole at 321.5 m). The average concentration over the drill length of CAU16 (to 298m) is 436 mg/l Lithium and 3,608 mg/l Potassium from 40 primary samples, taken at systematic depth intervals throughout the hole, including the high-grade interval. The four brine samples within the previously reported 169 m to 199 m interval average 619 mg/l Lithium and are part of the 81 m interval average 529 mg/l Lithium.
The brine body defined to date continues from CAU07 in the north, through CAU16 and further south to hole CAU15, which is currently being drilled. This is a distance of over 12.5 km approximately north south. These diamond core holes have all intersected relatively permeable sandy sediments that are expected to yield relatively high pumping rates from the NW Sector, which is very positive for future brine extraction.
Brine sampling was undertaken systematically at nominal 6 m depth intervals using both bailer and packer sampling equipment, depending on the conditions encountered in the hole. The average concentration for the high-grade interval (118-199 m) and average concentration over the entire length of CAU16 (to 298 m) is based on both bailed and packer samples.
The Mg/Li ratio in all brine samples is consistently low, averaging 2.5:1 across all the samples, and 2.3:1 in the high-grade interval. The consistently low Mg/Li ratio confirms the suitability of the brine for conventional brine processing, as applied at the nearby Olaroz project.
Drill core samples from CAU07 and CAU16 have been sent to an experienced porosity laboratory in the United States, where they will be analysed for drainable porosity characteristics for use in the upcoming resource estimate.
SE Sector Drilling – CAU08 and CAU11 Progress
In the SE sector, well development and pump installations have been completed on rotary holes CAU08 and CAU11 in preparation for initial pumping tests and collection of composite brine samples. Results of this test work are anticipated to be reported in December 2017.
President and CEO Mr David Sidoo also commented "These results give us further confidence to continue our exploration efforts in the very strategic NW sector, located immediately south of the Orocobre Olaroz properties. The CAU16 results suggest the brine body here has the potential to be an important part of the project resource base with good Lithium grades and a low Mg/Li ratio capable of supporting a stand-alone processing facility."