Several radio transmitters operate throughout the world in the VLF range, 15-30 kHz, and are used mainly for marine navigation, communication with submersed submarines, and other purposes.  The principle of VLF subsurface exploration is simple.  At large distances from the transmitter, the EM field is effectively planar and horizontal.  A conductor that strikes in the direction of the transmitter is cut by the magnetic vector, and these primary magnetic fields cause electric currents to flow in subsurface conductors.  In another, more recent, theory, the subsurface currents flow along interfaces between bodies of differing conductivity.

The Very Low Frequency (VLF) radio spectrum extends from 3 to 30 kHz. Standard communications receivers do not receive signals that low in frequency. Furthermore, most antennas used with standard communications receivers are optimized for higher frequencies and perform poorly in the VLF spectrum. Because of that, few Radio Amateurs or shortwave listeners have ever heard VLF signals and most know very little about the large number of stations in that part of the spectrum, what those stations are used for, or the nature of VLF radio signal propagation.

However, because VLF receivers and receiving antennas are easy to construct, the VLF spectrum attracts a small number of curious and sometimes very dedicated VLF listeners who want to learn more about this little-known and somewhat secretive part of the radio spectrum.

Signals from powerful VLF stations can be received worldwide. They penetrate deep into the earth and deep into the sea (especially in the lower portion of the VLF spectrum) and therefore can be received by submerged submarines. Though some VLF stations have other purposes, the primary function of most VLF stations is to communicate with submerged military submarines or help them navigate underwater.

http://www.smeter.net/stations/vlf-stations.php

http://sidstation.lionelloudet.homedns.org/stations-list-en.xhtml

Creso Exploration Inc. announces the award of a 5000 meter drilling program on the Shining Tree properties that will start this week including deepening by a further 300 m the Minto Hole #2 (18.2 g/t Au over 65.7 meters from 49.3 m to 115 m and 4.61 g/t Au over 79.6 meters from 132.4 m to 212 m – see) in order to do more down-hole geophysics and better delineate the gold bearing zone. Concurrently, Creso will initiate a detailed helicopter survey at 30m line spacing that will focus primarily on the Minto, Matona, Tyranite and Duggan Zones to outline known gold mineralization areas.

Creso has signed two airborne geophysical contracts with Terraquest Ltd both of which will start in July. The helicopter survey which will include Single Sensor High Resolution Aero-magnetics, Radiometrics and XDS/VLF-EM systems is based on 1779 line kilometers to be flown at low altitude with a 30m line spacing. The fix-wing aircraft will survey the entire eastern half of the Shining Tree properties covering large areas of the Tyrrell, Knight and Milner Townships survey and will include High Resolution Aero-magnetics, Horizontal Gradiometer, Radiometrics and XDS/VLF-EM systems over 5853 line kilometers at a 100m line spacing.

The combination of these two surveys is particularly well adapted to the Shining Tree Area where contrasts in hydrothermal alteration, mineralized volcanic and intrusive rocks, and complex structural features are common. Radiometric surveys will aid in delineating potassium enriched alteration zones commonly associated with gold mineralization in the area.

Creso Exploration intersects 65.7 meters of 18.2 g/t g and 79.6 meters of 4.61 g/t Gold in Hole #2 on the Minto Project.

The Minto showing consists of a pod of carbonate sulphide breccias containing an estimated tonnage of 225,000 tons (204,000 t) grading 0.2 oz per t (6.8 g/t) Au to a vertical depth of 225m as determined and reported in 1984.  Gold is related to pyrite and quartz veining trending north south and northeast southwest.

From surface geology the upper zone presents a true width of 30 meters. The bottom zone is new and no true width has been determined yet. According to JVX Ltd, the down‐hole geophysical interpretation completed on the Minto property, indicates that the mineralized body extends in a north‐west/south‐east direction at a depth of 50 to 170 meters and is open at depth. The Corporation will drill a step‐out hole for the purpose of further defining the location of the body using more down‐hole geophysics.

In May 2010, Borehole Induced Polarization (BHIP) surveys were done on the Tyranite and Minto properties. Results from the Tyranite hole are not yet available. 3D conductivity and chargeability models from boreholes gradient IP data have been calculated for holes M‐0901 and M‐0902 on the Minto property.

The Corporation has completed down‐hole geophysical testing on the MacMurchy property and intersected 7.4% nickel and 2 g/t platinum and palladium over one meter in hole D6‐07 confirming the nickel potential of the area. The MacMurchy property is located in the southwest corner of the MacMurchy Township some 10 km SSW of the Minto property.

The Corporation is currently evaluating bids for an agreement for a 200‐kilometer low level airborne (Mag, VLFEM, and radiometric) geophysical survey to cover the Minto, Tyranite and Duggan zone on a 30‐metre spacing in order to define geological structures and mineralized zones. Upon completion of the geophysical survey, the Corporation will undertake a 5000‐meter drill program on the Minto, Tyranite and Duggan properties.

Conductivity Model

The 3D conductivity model represented by an iso-surface value of 0.005 S/m shows three conductive features. The first conductive feature is at shallow depth and is strong in the west direction as well as in the east direction. The second conductive feature is disseminated in the middle while the third conductive feature is at depth and to the southeast. 

Chargeability Model

The 3D chageability model shows three chargeable features. The third chargeable feature (northwest – southeast) at depth is strongest. The second and third inversion shells correlate with the gold mineralization.

Auric Mining Corp. announces the results of an Airborne magnetic and VLF-EM Survey conducted for the company by Terraquest Ltd. of Markham Ontario. Terraquest Ltd. was contracted to perform a VLF Electromagnetic survey of the Company’s property in the Dog Lake area of Northern Ontario.

The survey confirmed a number of gold showings on the shoreline of Dog Lake, located a few hundred meters to the west of the property boundary. In the past there has been considerable ground geophysics and drilling conducted in this area. The magnetic maps show the presence of narrow magnetic linear features striking from a North to East trend and appear to occupy all of the three major rock types. At least ten diabase dykes have been interpreted from the second derivative pattern and almost all are certain to belong to the Matachewn-Hearts swarm that is prevalent in the area. In the southeast corner a lateral displacement of three dykes are interpreted as a fault.

One of the more significant features of the magnetic maps is the presence of narrow magnetic linear features striking from North to East. These are illustrated on the interpretation maps and appear to occupy all three major rock types. The OGS map shows several major faults or deformation zones in the general area and with the same strike direction. It is proposed that these magnetic linears could be related to them. They could represent fracture elements in a broad deformation zone and since they stretch into the gold showings to the west are of considerable interest now as possible channels of mineralization.

Based on the conclusions and recommendations of the VLF-EM survey, possible new exploration targets have been identified and further exploration recommended. An exploration program has been adopted and will be carried out in the coming months.

Auric Mining Corp. plans to do another similar survey in the near future using additional technology to better define these results before a full field exploration program commences this summer.

• Previous exploration in the Wawa has discovered numerous deposits of small diamonds within metamorphosed Archean basement rocks.
• Dianor has discovered rocks with encouraging grades and stone size distribution directly south of the Mori-Metalex ground.
• Island Gold Mine has Proven and Probable Reserves of 1,013,854 tonnes at a grade of 8.55 g/t gold for a total of 278,711 ounces of gold (NI 43-101 compliant report by GENIVAR) Project has additional Measured and Indicated Resources 454,705 tonnes at a grade of 10.26 g/t for a total of 149,972 ounces (NI 43-101 compliant report by GENIVAR).

In May 2010, Borehole Induced Polarization (BHIP) surveys were done on the Tyranite and Minto properties. Results from the Tyranite hole are not yet available. 3D conductivity and chargeability models from boreholes gradient IP data have been calculated for holes M-0901 and M-0902 on the Minto property.

The Corporation has completed down-hole geophysical testing on the MacMurchy property and intersected 7.4% nickel and 2 g/t platinum and palladium over one meter in hole D6-07 confirming the nickel potential of the area. The MacMurchy property is located in the southwest corner of the MacMurchy Township some 10 km SSW of the Minto property.

Creso Exploration is currently evaluating bids for an agreement for a 200-kilometer low level airborne (Mag, VLFEM, and radiometric) geophysical survey to cover the Minto, Tyranite and Duggan zone on a 30-metre spacing in order to define geological structures and mineralized zones. Upon completion of the geophysical survey, the Corporation will undertake a 5000-meter drill program on the Minto, Tyranite and Duggan properties.

Samples were assayed at the facilities of Swastika Laboratories of Kirkland Lake (Swastika, Ontario) a certified and accredited laboratory by a standard fire assay method. All samples with greater than 1.0 g/t Au were re-assayed by a pulp and metallics method. Above interval values are weighted averages.

Creso announces drill results from the MINTO Project located half-way between Timmins and Sudbury in Ontario - 65.7 Meters of 18.2 g/t g and 79.6 Meters of 4.61 g/t Gold in Hole #2.

The Minto showing consists of a pod of carbonate sulphide breccias containing an estimated tonnage of 225,000 tons (204,000 t) grading 0.2 oz per t (6.8 g/t) Au to a vertical depth of 225m as determined and reported in 1984 by Duncan Gold Resources, (White 2007) **. Gold is related to pyrite and quartz veining trending north south and northeast southwest.

Trueclaim Exploration Inc.  an explorer and developer of precious and base metals,  announces the completion of preliminary results of the airborne geophysical survey undertaken on the property and a summary of its activities on the Scadding Property.

The preliminary data from the recent airborne survey undertaken on the Scadding property and surrounding area has now been received, geo-referenced and overlain with our in-house interactive digital map base consisting of the underlying topography, claim fabric, geology maps, known mineral occurrences and other layers and classes. This survey, consisting of 2,943.9 line kilometres and covering an area of approximately 244.3 square kilometres, was undertaken by Terraquest of Markham Ontario. This survey was comprised of a total field magnetometer survey, horizontal gradient magnetometer surveys, a radiometric survey for each of Potassium, Thorium and Uranium as well as their recently developed triaxial VLF survey. Variations in the strength of the magnetic field have been used for to determine different rock types or alteration zones that could be related to gold mineralization. The variations in potassium content can be used to discriminate rock types as well as locating zones of anomalous potassium content (potassic alteration) within lithologies that normally have low values of this element. Potassic alteration has, in some cases, been known to be associated with gold mineralization. The triaxial VLF survey will allow for the better discrimination of conductors in a variety of orientations. The area of the survey included peripheral properties of several claim holders who also participated in the cost of the survey over their properties. At this time further work is being undertaken by Terraquest to enhance the quality of a final product.

The results of the preliminary geophysical interpretation of the survey show numerous anomalies that are now being examined on the ground by our field crews. Each person in the field has been equipped with a Garmin Map 60CSx handheld GPS units containing detailed 1:20,000 scale topographical maps of the area to ensure accurate and efficient location and examination in the field.

At this time three teams are simultaneously working on the property. Team 1 consists of a geologist and helper currently stripping, washing and mapping in the immediate area of the Scadding minesite to enhance information collected from our phase 1 drill program to be combined in our existing 3D model for enhanced targeting in the proposed phase 2 drill program. Team 2 consists of a geologist and 2 prospectors who are currently examining and sampling airborne anomalies and other sites outside the area of the Scadding minesite. The information collected from this work will be used to determine the best areas for further examination by detailed ground geophysics, geochemistry, stripping, washing, mapping and potentially diamond drilling where warranted. Team 3 consists of the senior geologist and a logistics coordinator and is focused on co-ordination of field activities, collection of data, preparation and submission of data as well as assessment reporting. Currently in addition to the submission of upcoming assessment work, detailed local sitemaps are being prepared for the examination and mapping of the many known gold, base metal and platinum group metal showings known on the site.

A geochemical and magnetic susceptibility analysis of the core was also undertaken comparing some of the gold mineralized areas with non-mineralized areas. This study has revealed some interesting correlations that are currently being studied further. It is felt that the results of this work may help in discriminating non-mineralized chlorite from the mineralized chlorite in which most of the gold occurs at the minesite.

The Milestone Project is located approximately 344 km northeast of Thunder Bay, and 40 km east of the town of Long Lac, NW Ontario.  The structural belt east of the Geraldton Camp (3.1 million ounces of gold) and Long Lac has always been thought to be the extension of the same productive belt, but has only seen limited exploration due to glacial cover.

Kodiak’s initial programs included the evaluation of historical surface work and diamond drilling has confirmed the gold-bearing nature of the Klob Lake Shear over a strike length of approximately 1,500 meters. The Company initially undertook a regional airborne survey covering the Milestone Option and part of the Klotz Lake Property in March, 2008.   The airborne VLF-EM and magnetic airborne survey consisted of 1,140 kilometers at 100 meter spacing; a prospecting program followed-up on VLF-EM and magnetic anomalies. Additional drilling at Milestone will establish the geometrical framework to the broad nature of gold mineralization along the regional Klob Lake Shear Zone and determine controls on higher grade zones.  As the target zone corresponds to a 4 km long airborne VLF-EM anomaly, a ground based IP/magnetic geophysical survey will further refine the target zone of interest and provide guidance for aggressive expansion of gold mineralization within the larger Klob Lake Shear Zone.

The large size of this system with a strike length of at least 2,500 metres, the consistent gold grades encountered in diamond drilling, and a recently identified higher grade zone of gold mineralization has prompted the company to undertake a 10,000 metre Phase Two exploration program. The Phase Two exploration program will consist of surface evaluation (prospecting, geophysical surveys, mapping, and trenching) along the Pag shear zone and parallel structural trends, continued wide spaced drilling to evaluate the gold system on strike and at depth, and infill drilling to further define the currently known higher grade portion of the mineralized system.

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.