Posts Tagged Max-Min

REPORTS ON 2010 GEOPHYSICAL EXPLORATION PROGRAMS FROM ATHABASCA BASIN

Posted by on Thursday, 14 October, 2010

Titan Uranium Inc. announces results from the 2010 geophysical exploration surveys in the Athabasca Basin on the company’s 100% owned Bishop II, Meanwell and R-Seven projects. Electromagnetic and resistivity surveys were completed with the objective of detecting conductors and hydrothermal alteration anomalies, respectively.  These features are typically found associated with fault zones and unconformity-type uranium deposits in the Athabasca Basin.

A number of conductors were located by Max Min Horizontal Loop Electromagnetic (HLEM) surveys on Grid BII_2009-1 and Grid M_2009-1 of the Bishop II/Meanwell projects. The conductors have been interpreted as steeply dipping conductive structures associated with conductive basement host rocks.  Direct Current (DC) resistivity surveys were able to image the conductivity structure of the earth below Grid BII_2009-1 to a depth of approximately 165 metres, where a low resistivity “chimney” was detected co-incident with convergent structural lineaments in N70˚ E, near E-W and NW-SE orientations.

On the R-Seven project, Moving Loop Array Time Domain Electromagnetic (TDEM) surveys were successful in detecting multiple conductors in grid areas ML-1 and ML-2. As a follow-up to the high priority conductive targets, DC resistivity surveys were performed over a portion of the ML-2 grid area where a prominent resistivity anomaly was also located in association with two of the conductors.  It has been interpreted that the resistivity anomaly in the lower sandstone rocks may represent the effects of hydrothermal alteration processes often associated with fault zones and unconformity-type uranium deposits.

Follow-up drilling is recommended on the Bishop II, Meanwell and R-Seven projects to test the high-potential targets identified in the 2010 geophysical exploration programs.


The new effort at legendary Rottenstone

Posted by on Tuesday, 28 September, 2010

The Rottenstone property is located approximately 130 kilometers NNE of the town of La Ronge, northern Saskatchewan consisting of 7 contiguous mineral dispositions covering 26,217 acres. The Rottenstone deposit was first discovered in 1928 as a surface exposure along the shoreline of Rottenstone Lake. The deposit was mined in the mid 1960s, producing 40,000 tons of high grade nickel-copper-platinum group elements plus gold (Ni-Cu-PGE +Au) ore; grading 3.28% Ni, 1.83% Cu and 9.63 g/t (Pt-Pd-Au). The Ni-Cu-PGE mineralization occurs as net-textured to semi-massive sulphide (40-60% sulphides) hosted in an ultramafic sill. The high Ni-Cu-PGE grades associated with Rottenstone are a function of the high proportion of contained sulphides. The host ultramafic sill is believed to be part of a significantly larger, sulphide-rich ultramafic intrusive body of similar grades occurring at depth and proximal to the known surface deposit. The exploration model is an ultramafic intrusive sill-like body comprised of net textured, semi-massive to massive Ni-Cu-PGE bearing sulphides occurring within structurally deformed supracrustal meta-sedimentary rocks.

Uravan has conducted exploration programs on the Rottenstone property intermittently from 1998 – 2008. Exploration includes, airborne geophysical VLF-EM/MAG and VTEM surveys, a property-wide tree-top biogeochemical survey, reconnaissance B-horizon soil geochemistry surveys, ground geophysical TEM, MAG, MaxMin, Gravity and IP surveys,  and  reconnaissance diamond drilling.  Forty-six (46) diamond drill holes amounting to 9,323 meters have been drilled and sampled.  Drilling to date has been reconnaissance in nature, targeting favorable coincident geophysical – geochemical profiles.

Based on the combined Rottenstone geophysical surveys (VTEM, EM, IP and gravity), the Corporation recently completed a re-examination of this data using more current interpretive/modeling geophysical techniques. As a result, recent interpretive-modeling of the Rottenstone database (geological, geochemical and geophysical), has establish new Ni-Cu drill targets proximal to the previously minded Rottenstone deposit. These drill targets were established using Resistivity Depth Imaging (RDI).  RDI is a graphic representation of inverted EM (electromagnetic) decay data into conductivity/resistivity depth profiles. These profiles are then displayed in 2-dimensional (2D) cross-sections.  Other geological, geochemical and structural information can then be displayed in cross-section with the RDI profiles.

The coincident display or stacking of other geological data on the RDI 2D profiles has greatly enhanced the Corporations ability to vector drilling toward new potential mineralized ultramafic bodies.  Several proposed drill holes specifically target sub vertical conductive geophysical responses (EM conductors). These steeply dipping conductors are generally supported by other favorable geological, structural or geochemical features, and other geophysical anomalies (i.e. IP and gravity). It is anticipated that these new targets will be drill tested in early 2011.


First Ever Airborne Geophysical Survey over the Gjegjan District in Albania

Posted by on Saturday, 27 March, 2010

The first airborne geophysical survey of the historically prolific Gjegjan District in Albania has identified multiple exploration targets, never before drilled.

Initial data processing from the recently flown airborne geophysical survey has identified several geophysical anomalies that are previously undrilled. Of particular interest is a new target called Perbreg. The Perbreg geophysical anomaly is located on strike and approximately 2km south of the Gjegjan mine, which operated between 1961 and 1993, and estimated production 4,420,000 tons of 3.3% Cu (source: Albanian Geological Survey). The newly identified Perbreg anomaly is under a very thin limestone cover that hid the volcanic sequence from past state run exploration programs. The Perbreg anomaly is coincident with a significant geochemical anomaly that was identified in 1985 but was never drilled and never explained.

Several other anomalies within a 10km radius of the former mine have been identified as high priority exploration targets. Based on the airborne geophysical data, technical crews are now mobilizing onsite to follow up in these target areas with ground work including Max/Min electromagnetic ground geophysics, induced polarization ground geophysics, detailed soil sampling and geological mapping. This initial fieldwork is being done to develop multiple initial drill targets in the northern block of the property, in close proximity to the historic mine.

Data interpretation from the airborne survey flown on the southern portion of the district is expected within two weeks. The airborne survey was approximately 1200 line kilometers in two survey grids. Line spacing was 125m on the north grid and 200m on the south grid. Geotech Airborne Ltd. completed the survey, which was a combined high-resolution helicopter borne magnetic and electromagnetic survey, utilizing their Versatile Time Domain Electro Magnetic System (“VTEM“).

John LaGourgue, Volcanic’s President and Chief Operating Officer states, “These positive results are indicative of what can be accomplished as Volcanic conducts the first ever large scale and modern exploration of the Gjegjan District. While the district is home to significant past production, Volcanic is using modern exploration tools and techniques in the district to fully explore the potential of this 200 square kilometer property.”


Wildcat’s EM targets are drilled

Posted by on Monday, 11 January, 2010

The Wildcat project is located 90 kilometres west of Watson Lake, in the Rancheria District of southern Yukon, Canada.  1,940 hectares in size (19.4 sq km), widespread silver-lead-zinc mineralization occurs across the property. Mineralization on the Wildcat was discovered in the early 1940s where early work focussed on a series of narrow, high-grade argentiferous galena veins and fracture filings, hosted primarily within dolomite and limestone.  More recent work, including diamond drilling in the mid 1980s, was directed at the ‘Main Zone’, a zone of manto-style silver-lead-zinc mineralization.

From 1983 – 85 most work tested a large gossan zone in the central part of the property (the Main Zone). Butler Mountain Minerals completed a Pulse EM survey over the gossan zone and identified a strong, 600 meter long, north-northeast trending conductor. From 1983-85, 35 diamond drill holes were drilled, the majority of which tested this target. Drilling successfully intersected multiple zones of massive pyrrhotite-sphalerite mineralization, with results including 12 feet grading 6.2% Zn, 1.09 oz/t Ag and 0.32% Pb (ddh 83-3), 7 feet grading 5.06% Zn and 9.86 oz/t Ag (ddh 83-6), and 10 feet grading 11.58% Zn, 1.05 oz/t Ag and 0.7 % Pb (ddh 85-10).

During 2008, Killdeer Minerals Inc. completed a horizontal loop electromagnetic (HLEM) survey over the central portion of the Wildcat property. The purpose of the survey was to confirm, re-locate and better define the EM conductor at the Main Zone, as a guide to subsequent drilling, and to test for other conductors elsewhere on the property.

Seven HLEM conductors were identified by the Killdeer Minerals’ 2008 survey. Two of these anomalies are high priorities for follow-up, anomaly H-A (the Main Zone anomaly) and anomaly H-F (1 kilometer to the northwest of H-A) on the lower east flank of Little Guy Hill.

The Main Zone HLEM anomaly is a 1200 meter long, complex north-northeast trending conductor, which is coincident with Pulse EM and VLF-EM conductors identified by previous surveys and with a significant positive magnetic field response. Based on the geophysical response, two styles of mineralization are interpreted, a north-northeast trending, steeply west-dipping mineralized fault zone and, east of this, moderate east-dipping conformable sulfide mineralization, on the east flank of an anticlinal structure. The associated positive magnetic field response results from the pyrrhotite-dominant mineralization. While the fault-controlled mineralization is well tested by previous drilling, drilling has been poorly oriented to test for east-dipping mineralization east of the fault. This is a high priority for follow-up drilling. The other high-priority target for follow-up drill testing is a 200 meter long, north-northeast trending HLEM conductor, also with an associated positive magnetic response, located 1 kilometer to the northwest of the Main Zone in an area of widespread manganese gossan and elevated soil geochemistry.

One of the 2009 drill holes tested a HLEM conductor related to a distinct tectonic zone situated approximately 900 metres east from the Main Zone. At shallow depth the hole intersected a very strongly leached, stratabound zone of limonite-hematite mineralization enriched in base metals related to paleo-karst settings. The hole did not reach target depth and due to technical problems was prematurely terminated in a fault zone enriched in gold related to pyrite-chalcedony mineralization.
Additional geological mapping, soil sampling and electromagnetic surveys are required to identify other geological settings favorable for occurrence of manto-style mineralization of
better integrity prior to further drilling of the Wildcat property.

TITAN URANIUM LAUNCHES GEOPHYSICAL PROGRAMS in Athabasca Basin

Posted by on Monday, 21 December, 2009

Saskatoon – Titan Uranium Inc announces that it has commenced geophysical programs on several Athabasca Basin properties in Saskatchewan. A D.C. Resistivity and Max Min Horizontal Loop ElectroMagnetic (HLEM) geophysics program on Titan’s wholly owned Bishop I and Meanwell properties is now underway with results expected in January 2010.  In addition, geophysical work will be carried out over Titan’s R-Seven Project beginning in early January 2010 consisting of TDEM (Time Domain ElectroMagnetic) Moving Loop surveys with results expected by the end of the first quarter of 2010.

D.C. Resistivity is the geophysical technique of choice in the Athabasca Basin due to its ability to image hydrothermal alteration systems often associated with fault zones and unconformity-type uranium deposits.  The alteration zones show up as resistivity “chimneys” due to the significant contrast in resistivity between the structural zones and their surrounding rocks. The program will consist of ten lines totaling 20 line km, with line spacing of 150 m.
Max Min HLEM and TDEM Moving loop surveys are electromagnetic (EM) techniques used to detect and delineate conductors and conductive formations in the Precambrian basement rocks at or under sandstone cover.  Both EM surveys have been designed to optimize resolution within that interval. The surveys will consist of eleven lines of HLEM (24.2 km) and two lines of TDEM Moving Loop (17 km).

Most of the Athabasca Group sandstone rocks exhibited moderate to strong bleaching and clay alteration was well developed.  Strong alteration was found in basement rocks below the unconformity, mainly along fractures. Weak Uranium anomalies were observed in both the sandstone and basement rocks.


MaxMin geophysical anomaly was tested successfully

Posted by on Monday, 16 November, 2009

Canarc Resource Corp.  announces that its recent 2009 drill program on the Tay-LP gold property located within the Tintina gold belt of the Yukon Territory intersected gold mineralization in all ten drill holes. The drill program successfully extended the gold mineralization along strike and/or down dip from three areas with previous drill intercepts on the property. James Moors, Vice President commented, “The 2009 drilling program consistently intersected and extended known gold mineralization by 50-100 m along strike and down dip from the three gold zones previously defined within a 3 km MaxMin geophysical anomaly that trends parallel to a large intrusion.  In general, our drilling hit broader zones of lower grade gold mineralization compared to the previous drilling.  Higher grades appear to be associated with higher temperature quartz-pyrrhotite gold mineralization. These 2009 drill holes are still 1000 m east of the intrusive contact and have yet to test the full length of the MaxMin anomaly. Combine these factors with the existence of two other intrusive bodies, and numerous other untouched geophysical and geochemical anomalies and it is safe to say we have many attractive targets that we are looking forward to testing with the next exploration program.”