Houston Lake drills 18 m of 4.22% Li2O at Pakeagama2013-08-01 11:25 ET - News Release
Mr. Trevor Walker reports
HLM CONFIRMS HIGH-GRADE AND CONTINUITY OF RARE METALS MINERALIZATION WITH REMAINING HOLES FROM PHASE I DRILLING ON THE PAK RARE METALS PROJECT, ONTARIO
Houston Lake Mining Inc. has provided the results of remaining five drill holes from the phase I, six-hole diamond drill program on the Pakeagama Lake pegmatite.
On July 2 2013, HLM reported a 154 m intersection of Li, Ta and Rb mineralization on the first hole drilled this past winter. The additional 5 holes have confirmed continuity of the zones along strike of the intersection and beneath the surface outcrops, and also defined bounding contacts with host rock(s). Table I below summarizes the lithium, cesium, tantalum and rubidium grades for the five drill holes by mineralogical zones for the pegmatite intersections. Also included are the results for DDH PL-13-001 as reported on July 2 complete with the addition of its cesium grades.
CORE LENGTH/DRILL-HOLE INTERCEPTS (PAKEAGAMA LAKE PEGMATITE)
DDH PL-13-001 Designed to test extent of pegmatite zonation beneath the enriched UIZ/CIZ zones on surface near
channel cuts 1 to 7
Zone Width (m) Li2O (%) Cs2O (%) Ta2O5 (ppm) Nb2O5 (ppm) SnO2 (ppm) Rb2O (%) Geology
Total pegmatite
38.0-192.55 m 154.55 1.22 0.064 111 64 137 0.41 LIZ/UIZ
Tantalum, rubidium and cesium enriched zones
38.5-97.0 m 58.50 n/a 0.073 121 65 175 0.55 WZ+CIZ
incl. 38.5-44.0 m 5.50 n/a 0.061 241 79 258 0.26 WZ
incl. 44.0-97.0 m 53.00 n/a 0.075 108 63 166 0.58
incl. 72.7-97.0 m 24.30 n/a 0.059 149 100 125 0.54 CIZ
incl. 76.0-82.0 m 6.00 n/a 0.040 206 142 121 0.25
Lithium and rubidium enriched zones
97.0-192.55 m 95.55 1.62 0.059 105 64 113 0.32 UIZ+LIZ
Lithium enriched zone
120.0-132.0 m 12.00 2.93 0.058 108 50 34 0.24 UIZ
incl. 127.0-132.0 m 5.00 4.01 0.058 131 45 27 0.10
Lithium and rubidium enriched zones
120.0-192.55 m 72.55 1.96 0.054 106 69 128 0.33 LIZ+UIZ
incl. 132.0-192.55 m 60.55 1.76 0.054 106 72 146 0.35
incl. 120.0-183.0 m 64.00 2.05 0.060 105 66 104 0.35
incl. 120.0-155.0 m 35.00 2.44 0.071 105 42 81 0.37
DDH PL-13-002 Designed to test Cs potential under pollucite-bearing aplite dike at surface and to define western
margin of pegmatite. First of two holes along with DDH PL-13-004, drilled to cross-section the
pegmatite. Toe of hole was in pegmatite.
Zone Width (m) Li2O (%) Cs2O (%) Ta2O5 (ppm) Nb2O5 (ppm) SnO2 (ppm) Rb2O (%) Geology
Pegmatite/aplite dike near surface (tantalum enriched)
5.0-17.5 m 12.50 0.10 0.025 132 59 32 0.06 Pegmatite
Rubidium and tantalum enriched zones
174.0-191.0 m 17.00 0.86 0.044 134 95 115 0.36 LIZ/aplite
incl. 174.0-185.0 m 11.00 0.88 0.053 130 82 157 0.51 LIZ
DDH PL-13-003 Designed to define zonation and to test the economic potential at the west-northwest extent of the
exposed pegmatite in the vicinity of channel cuts 14 to 17.
Zone Width (m) Li2O (%) Cs2O (%) Ta2O5 (ppm) Nb2O5 (ppm) SnO2 (ppm) Rb2O (%) Geology
Total pegmatite
21.0-84.05 m* 63.05 2.53 0.044 83 58 66 0.22 WZ/CIZ/LIZ/UIZ
Tantalum, rubidium and cesium enriched zones
incl. 21.0-32.0 m 11.00 n/a 0.097 169 75 163 0.45 WZ/CIZ/LIZ
incl. 21.0-27.0 m 6.00 n/a 0.123 209 91 207 0.57 CIZ/LIZ
Lithium enriched zones
incl. 27.0-83.0 m 56.00 2.61 0.035 70 53 51 0.18 LIZ/UIZ
incl. 36.0-54.0 m 18.00 4.22 0.040 41 20 21 0.06 UIZ
incl. 54.0-84.05 m 30.05 1.67 0.026 74 60 59 0.23 LIZ
* Zone includes 1.8 m of metasediments not sampled but included as dilution.
DDH PL-13-004 Along with DDH PL-13-002, the hole layout was designed to define the pegmatite zonation and contacts
in the central part of the known pegmatite by cross-sectioning the pegmatite.
Zone Width (m) Li2O (%) Cs2O (%) Ta2O5 (ppm) Nb2O5 (ppm) SnO2 (ppm) Rb2O (%) Geology
Total pegmatite zone including granitic sheets/rafts
14.2-130.7 m** 115.80 0.92 0.025 56 35 47 0.19 WZ/UIZ/CIZ/
LIZ/aplite/
granite
Lithium enriched zones
70.30-91.3m 21.00 2.74 0.040 85 44 69 0.19 UIZ/LIZ/WZ
incl. 70.3-85.0 m 14.70 3.43 0.035 59 35 65 0.16 UIZ
Rubidium enriched zones
incl. 55.0-60.55 m 5.55 1.52 0.064 80 47 74 0.42 LIZ
incl. 120.0-130.7 m 10.70 1.82 0.023 68 60 70 0.33 LIZ
Tantalum and rubidium enriched zones
incl. 14.2-22.0 m 7.80 n/a 0.072 107 77 84 0.73 CIZ
incl. 30.4-39.0 m 8.60 n/a 0.036 212 131 192 0.25 CIZ/aplite
** Zone includes 27.25 m of granite not sampled but included as dilution
DDH PL-13-005 Designed to intersect the metasediment-pegmatite contact from the north-northeast and to test the
extent of the pegmatite toward the granite contact to the south-southwest.
Zone Width (m) Li2O (%) Cs2O (%) Ta2O5 (ppm) Nb2O5 (ppm) SnO2 (ppm) Rb2O (%) Geology
Total pegmatite
65.0-144.1 m 79.10 1.64 0.028 116 93 210 0.29 LIZ/UIZ
Lithium plus tantalum and rubidium enriched zones
incl. 65.0-119.0 m 54.00 1.79 0.025 78 61 100 0.33 LIZ
incl. 119.0-125.0 m 6.00 3.57 0.035 74 37 29 0.18 UIZ
incl. 125.0-144.1 m 19.10 0.60 0.034 236 204 577 0.20 LIZ
DDH PL-13-006 Designed to test extent of granitic rock/rafts and pegmatite zonations above the pegmatite zone
intersected in hole PL-13-001.
Zone Width (m) Li2O (%) Cs2O (%) Ta2O5 (ppm) Nb2O5 (ppm) SnO2 (ppm) Rb2O (%) Geology
Pegmatites including granite sheets/rafts
48.5-52.85 m 4.35 1.80 0.048 56 25 42 0.22 Pegmatites/
granite
64.0-98.75 m 34.75 0.77 0.056 86 53 74 0.41 WZ/CIZ/UIZ/
granite
Tantalum, rubidium and cesium enriched zones
Pegmatite
73.4-96.0 m 22.60 n/a 0.064 114 69 96 0.53 WZ/CIZ/LIZ
incl. 75.0-92.0 m 17.00 n/a 0.071 124 72 108 0.60 CIZ
incl. 75.0-79.0 m 4.00 n/a 0.096 60 24 65 0.88 CIZ
incl. 78.0-86.0 m 8.00 n/a 0.074 161 99 156 0.63 CIZ
Lithium enriched pegmatite
incl. 67.0-69.15 m 2.15 3.87 0.032 79 30 41 0.10 UIZ
(1) The intervals in the table are drill intersection widths. There is currently insufficient data to determine
the true thickness of the pegmatite.
n/a is not applicable
The Upper Intermediate (UIZ), Central Intermediate (CIZ) and Lower Intermediate Zones (LIZ) were previously described in the July 2, 2013 Press Release. Zones of sodic aplite are present in all holes varying in widths from tens of centimetres to several metres and contain significant concentrations of, Ta, Rb and Cs.
Noteworthy observations are that the NNE boundary with the metasediments is consistent and predictable while the SSW contact with the granite is somewhat erratic and complicated by granitic blocks and rafts and appears to have been variably affected (metasomatized) by the pegmatite intrusion events. The mineralized pegmatite remains open to the WNW, ESE and at depth. Granitic blocks/rafts mapped on surface appear to diminish with depth and along strike in both directions. The cesium mineral pollucite commonly occurs within the CIZ intercepts and less commonly within the LIZ. The mineral is found as rounded-blebs and small masses ranging in size from 10 to 30 mm.
The locations of all holes relative to the channel cuts and surface outcrops are illustrated on Figures I to IV along with 4 sections illustrating the assay zones from Table I (located at https://houstonlakemining.com/images/pdf/Figures_July_30_2013.pdf). The current strike length of the pegmatite as defined by surface mapping and drilling remains at 250 m with an estimated width varying from 45 to 125m assuming sub-vertical orientation of the pegmatite body.
HLM has recently received a sub-metre satellite image of the project area, which will be used as a base map for all subsequent work, first of which will be a sub-centimetre total-station survey which will tie together drill collars to the cut grid located outcrops and channel cuts.
"These results confirmed our resolve that the Pakeagama Lake pegmatite is significant in size with abnormally high grades of lithium and rubidium plus tantalum and potential for cesium. We are pleased to have successfully completed the field work for what was a very exciting Phase I drill program," said Trevor R. Walker, President of HLM. "These first drill-hole results near-surface from the Pakeagama Lake pegmatite display significant mineralized widths and continuity confirming potential to become a leading high grade, multi-element, large tonnage exploration target for rare metals in North America. Based on these results, a Phase II diamond drill program has been independently recommended to HLM."
Due DiligenceAll scientific and technical information in this release has been reviewed and approved by Peter J. Vanstone, P.Geo., the qualified person (QP) under the definitions established by National Instrument 43-101. Under HLM's QA/QC procedures, the diamond drill contract specified NQ-sized drill core providing a 47.6 mm diameter sample. The drill holes were oriented perpendicular to the strike of the pegmatite and drilled continuously across it. Sample security and chain of custody started with the removal of core from the core tube and boxing of drill core at the drill site. The boxed core remained under the custody of the drill contractor until it was transported from the drill to the secure on-site Core Shack facility by either the drill contractor or one of the Company's designated personnel. At the on-site Core Shack, core boxes were opened and inspected to ensure correct boxing and labelling of the core by the drill contractor, photographed and then re-closed. The core was stored securely until moved into the Core Shack for processing. The company geologists logged the core, and then marked and tagged it for sampling and splitting. Each core sample was assigned a tag with a unique identifying number. Sample lengths are typically one meter, but can be less depending on zone mineralogy and boundaries. The Core was then re-closed and shipped to the company's off-site core splitting facility in Sudbury, Ontario. Core marked for splitting was cut using a diamond core saw with a mounted jig to assure the core was cut lengthwise into equal halves. Half of the core was sent to an analytical laboratory for quantitative analysis of select elements. The remaining half of the core is retained and incorporated into HLM's secure, off-site core library.
All samples were assayed by an ISO accredited laboratory. Sample blanks along with tantalum, lithium, rubidium and cesium certified reference material was routinely inserted into the sample stream in accordance with industry recommended practices. Field duplicate samples were also taken in accordance with industry recommended practices.