Posts Tagged graphite

EM surveys over Green Giant graphite property in Madagascar

Posted by on Tuesday, 24 February, 2015

by Alexander Prikhodko, 24 Feb., 2015

Graphite mineralization has a high electrical conductivity, which makes it an excellent target for electromagnetic (EM) methods.

Energizer Resources Inc. and it’s predecessors have conducted several airborne and ground electromagnetic  surveys over different areas of Green Giant graphite property in Madagascar (province of Toliara). Different EM technologies have been used in accordance with their progress.

Geological position and characteristics of the property:

Regional position – Ampanihy Shear Zone, NS foliation of rocks;

-Vertical to sub-vertical nature;

-The area is underlain by supracrustal and plutonic rocks deformed with N-NE trending structures;

-Graphitic zones consist of multi-folded graphitic strata;

-Graphitic schist and gneiss with vanadium mineralization.

 Geologic map (magnetic field interpretation)


















AEM surveys covering with different technologies is in the picture above.

The basic AEM surveys results which demonstrate a potential of the territory and effectiveness of the applied methods are below.


DIGHEM survey

Inverted (EMflow, Encom) DIGHEM data. Conductivity 3D voxel, sections and a map.

(conductors in red, resistors blue colors)
























VTEM survey

Time-domain EM TAU parameter calculated with sliding window algorithm picks up the most conductive part of the geoelectrical section on each station-sounding.















The resistivity-depth imaging (RDI) of EM time-domain data is a base of depth positioning of conductors potential for graphite mineralization and the first approximation of their geometry and dimensions.










3D apparent resistivity distribution with <1 Ohm-m clipping areas:



Graphite discoveries in Northeastern Ontario

Posted by on Thursday, 16 May, 2013

Zenyatta Ventures Ltd. announced a drilling update on the 100% owned Albany (Hydrothermal) Graphite Deposit, located in northeastern Ontario, Canada.

The first drill hole (Z13-4F10) intersected 363 metres (‘m’) of graphite mineralization from 47.0 m to 410.0 m.  This represents the widest zone of graphite material intersected to date on the Albany deposit.  The hole, which was drilled at a 180 azimuth and -65 dip, was designed to test between previously drilled holes 5 and 9.  From surface to 41.0 m hole 10 intersected overburden and from 41.0m to 47.0 m intersected Paleozoic limestone.  Graphitic overprinting was encountered from 47.0 m to 87.0 m, while the strongest graphitic mineralization was intersected from 87.0 m to 410.0 m. Drilling shows different types of graphite mineralization consisting of clasts of graphite vein material, disseminated graphite matrix and discrete graphite veins / veinlets as part of a large breccia pipe.  Geometry and true width of the graphite breccia pipe is difficult to determine at this point and will require much more drilling.

The Company will continue to define the size and grade of this rare, ‘vein-type’ or hydrothermal-style graphite deposit.  The goal of the current program will be to expand on a 2012 drilling campaign that intersected a large mineralized zone of graphitic breccia and veining from widely spaced drill holes.  This previous nine (9) hole drill program succeeded in establishing widespread graphite mineralization laterally for several hundred metres and to a vertical depth of 400m, where it remains open. The current drilling will consist of a minimum of 10,000m and will further test the extent of the Geotech VTEM airborne conductor. The program will require 40 holes and is expected to continue until August, after which a NI 43-101 resource estimate will be calculated. The Company anticipates a steady flow of information from drilling activities and continued metallurgical work from this fully funded $4 million exploration program for the balance of 2013.

14 May 2013

Zenyatta Ventures Ltd. announced the following significant assay results from the first hole (#10) of the current campaign on the 100% owned Albany (Hydrothermal) Graphite Deposit, located in northeastern Ontario, Canada.   Drill hole 10 intersected 360.8 metres (‘m’) of graphite mineralization from 49.0 m to 409.8 m yielding an average grade of 5.1% Carbon (‘C’).  This represents the widest zone of graphite material intersected to date on the Albany deposit.  The hole, which was drilled at a 180° azimuth and -65° dip, was designed to test between previously drilled holes 4, 5 and 9.  Five more holes have since been completed, all of which yielded broad intervals of graphite mineralization from visual observations of drill core as described below.  Holes 11 through 15 have been designed to start outside the limit of the indicated anomaly and were angled to help define and confirm the overall geometry of the pipe-like body.  Drill hole data from all 15 holes is shown in a table at the end of this press release.

• Drill hole 11 intersected 202.0 m of graphite mineralization from 393.0 m to 595.0 m.

• Drill hole 12 intersected 195.0 m of graphite mineralization from   90.0 m to 285.0 m.

• Drill hole 13 intersected 219.0 m of graphite mineralization from   96.0 m to 315.0 m.

• Drill hole 14 intersected 286.9 m of graphite mineralization from 108.8 m to 395.7 m and a second zone of 127.3 m of graphite mineralization from 431.3 m to 558.0 m

• Drill hole 15 intersected 301.9 m of graphite mineralization from   63.3 m to 365.2 m.   (All lengths reported are drill intersected core lengths and do not represent true widths)

Aubrey Eveleigh, President and CEO stated “These latest results confirm the exceptional size potential of the Albany graphite deposit and along with the previously announced ultra-high purity (>99.99% C) values, underpins Zenyatta’s extraordinary graphite project. Hole 10 represents the best grade drill intersection obtained to date and the more recent drill holes are confirming both the internal continuity and the extent of the deposit.”   Graphite mineralization appears to consist of graphitic breccia pipes which are typically surrounded by a zone of graphite overprinted syenite. Carbon analyses for drill holes 11 through 15 will be released once received.  Drill hole 16 has commenced, and the current campaign will continue until sufficient drill holes have been completed, following which a NI 43-101 compliant resource estimate will be prepared.  A plan map, section and drill hole table will be placed on the website today.

The Company has also completed a ground geophysical survey to better define the geometry of the Albany graphite breccia pipes and expects the full data to be released in the next few days once a final report has been completed by Crone Geophysics and Exploration Ltd. The survey has defined two adjacent, strongly conductive, geophysical (EM) anomalies that are roughly circular in shape.  Holes 10 through 15 were drilled on the eastern most anomaly (Eastern breccia pipe), and are suggesting an oval shaped body approximately 200 metres in a NW-SE long axis by approximately 125 metres NE-SW.  Additionally, hole 11 intersected mineralization at approximately 500 metres vertical depth.  Drill intercepts appear to be correlating well with the shape of the ground geophysical anomaly with additional drilling required to confirm this model. The western anomaly (Western breccia pipe), which appears to be larger, will also be fully tested during the current drill campaign.

“Detecting vanadium and graphite deposits with EM methods”

Posted by on Monday, 23 July, 2012


“The recent rush to find graphite and vanadium deposits to satisfy potential demand in green energy applications is reigniting airborne electromagnetic (EM) methods as highly effective exploration tools.”

read more..

Graphite deposit on Madagascar with geophysics

Posted by on Tuesday, 29 May, 2012

Energizer turned its attention to graphite in November 2011, and continues to identify new graphite opportunities on its 120 kilometre-long Green Giant Project.  Through the completion of 29 diamond drill holes over 3,780 metres, 20 trenches over 1,900 metres, regional sampling with 670 prospecting samples, geological mapping of 3 areas, analysis of 3 airborne geophysical surveys, and the completion of 160.5 kilometres of ground-based electromagnetic geophysical surveying, the Company has identified over 320 kilometres of graphitic trends.

Airborne survey over the Henry Graphite Property

Posted by on Thursday, 10 May, 2012

First Graphite Corp. announces that Geotech Ltd. has completed the Versatile Time-Domain Electromagnetic (VTEM) geophysical survey over the Company’s Henry Graphite Project (the “Property”). The VTEM survey over the property covered 1452 line kilometres, at 200-metre line spacing. The purpose of the survey, which was completed on May 6, 2012, was to confirm the historically identified graphite-bearing conductors, and to identify new targets for follow-up work.First Graphite expects to receive preliminary survey results from Geotech Ltd. in the next couple of weeks, at which time it will provide further information. Preliminary and final data will be used by the Company to guide its ground exploration program which will consist of surface sampling, geological mapping and drilling. Interpretation of the final data will be conducted by Living Sky Geophysics Inc., of Saskatoon, Saskatchewan.

Henry Property

The Henry Property consists of six mineral claims covering approximately 22,853 hectares and is located 10 kilometres southwest of the community of Southend, Saskatchewan. Historical exploration suggests that the Property has potential to host a near-surface graphite deposit comprised of scarce, large-flake, high-purity graphite. It is situated within high-grade metamorphic rocks of a sedimentary origin which is an ideal setting for the development of these types of deposits.The technical information in this news release has been reviewed on behalf of the Company by Neil McCallum, P.Geo., of Dahrouge Geological Consulting Ltd., a Qualified Person pursuant to National Instrument 43-101.

About Geotech Ltd.

Geotech has conducted airborne electromagnetic geophysical surveys for more than three decades using proprietary technology and has created a long history of notable innovations. Innovation is the secret to Geotech’s sustainability, making Geotech the longest running company to offer airborne electromagnetic surveying, world-wide. In the last decade Geotech introduced to the world the first helicopter-borne time domain EM system. The VTEM airborne EM system, with its superior S/N ratio, is still the industry standard, able to detect deep conductors that are “lost” in the noise of other TEM systems.


Graphite is a polymer of carbon that comes in three naturally occurring forms – flake, amorphous, and lump. All three are found in metamorphic as well as igneous rocks, varying by grade, particle (mesh) size and moisture content. Graphite exhibits a number of characteristics, which make it a high value industrial mineral with a broad range of applications: it is an excellent conductor of heat and electricity, is resistant to strong acids and thermal shock, is a lubricant, is refractive and has the highest natural strength and stiffness of any known material.The total worldwide graphite market is currently estimated to be US$12 billion. At present, the largest end use markets for graphite are the steel and automotive industries. However in recent years, emerging markets, including green energy development (fuel cells, solar energy and nuclear power) and batteries (lithium-ion and vanadium-redox) are creating the potential for incremental increases in demand. Meanwhile, the closure of a number of natural graphite mines in China, the world’s largest producer, is reducing world-wide supply.

Airborne Geophysical Survey Over Henry Property

Posted by on Friday, 20 April, 2012

First Graphite Corp.  announces that that it has retained Geotech Ltd. to conduct an airborne Versatile Time Domain Electromagnetic (VTEM) and a horizontal magnetic gradiometer survey over its Henry Property. The property is comprised of six mineral claims and covers 22,850 hectares of land near the community of Southend Saskatchewan. Based on the results of historical exploration and its proximity to the Deep Bay Deposit, the Company believes that the Henry Property has the potential to host near-surface graphite deposits containing scarce, large-flake, high purity graphite.The purpose of the survey is to confirm the historically identified graphite-bearing outcrops and conductors, and to identify new targets for follow-up work. The interpretation of this data, along with the historic drill-hole intersections of graphite and existing structural information, will be used for advanced forward plate modelling of the graphitic horizons at depth. This interpretation will be conducted by Living Sky Geophysics Inc., of Saskatoon, Saskatchewan, and will guide future exploration. Future exploration is anticipated to include surface sampling, mapping and drilling.The helicopter-borne VTEM survey, which is expected to commence within the next few days, will cover the entire property (1452 line kilometres), at 200-meter line spacing, and is expected to take about one week to complete. Geotech’s VTEM plus system is excellent for locating discrete conductive anomalies as well as mapping lateral and vertical variations in resistivity. The VTEM plus system is equipped with a high-sensitivity magnetic gradiometer for mapping geologic structure and lithology. VTEM plus offers the industry’s highest signal/noise ratio and spatial resolution of conductors and unparalleled depth of investigation.

Read more:

Discovery of Graphite Deposit in north-eastern Ontario

Posted by on Sunday, 29 January, 2012

Zenyatta Ventures Ltd; Update on 2011 Drill Program; Discovery of Graphite Deposit at Albany Project, north-eastern Ontario

Zenyatta Ventures Ltd. provides an update on the phase I and II drill programs at the Albany Project near Hearst in north-eastern Ontario.

To the end of December 2011, a total of 26 holes (~10,000 metres) have been completed testing 21 geophysical targets identified by Geotech’s VTEM 35 airborne system in 2010. A number of geophysical targets remain to be tested and the Company will be reviewing those to determine the appropriate 2012 exploration program.

A drill hole on claim block 4f was designed to test a strong, large airborne EM conductor measuring 1400 metres by 800 metres.  The hole intersected eight (8) separate and extensive breccia zones consisting of variably sized granitic clasts set in a black matrix containing graphite (carbon). Core photos, section and maps can be seen on the website at under the heading Projects.  The geophysical anomaly was explained by the conductive graphite matrix which is highly unusual in character and size.  A chemical and petrographic analysis is underway to better understand the nature and economic significance of the newly discovered graphite deposit.

The Zenyatta graphite discovery is located 30km north of the Trans Canada Highway and approximately 4km from an all-weather road.  It is near surface, underneath glacial till overburden. Although much more work is needed to determine the full importance of Zenyatta’s new graphite deposit, the outlook for the global graphite market is very bullish.

Also during the drilling campaign several holes intersected a series of layered mafic-ultramafic intrusions with cumulate textures and mineralization indicative of an environment that produces magmatic sources of nickel, copper, and platinum group metals related to Mid-Continent Rifting.  For example, drill holes testing targets on claim blocks 4a, 4b, 2b and 2i intersected gabbroic/pyroxenitic bodies, believed to be of Proterozoic age, containing local magmatic sulphide droplets of pyrrhotite, pyrite and chalcopyrite, which validates the original geological theory upon which the Albany project was based.  To date, assay results have not shown any economic nickel or copper values, but the Company is encouraged by these newly identified, favourable sulphide-bearing intrusions.  Zenyatta will be contemplating down-hole geophysics to further define existing targets and carrying out additional interpretation of the assay results.  This will help determine the location of additional drilling and identify secondary targets to further test for magmatic mineralization.  Further exploration work is warranted.

Graphite – the growing market for geophysics

Posted by on Thursday, 5 January, 2012

Global consumption of natural graphite has increased from approximately 600,000 tonnes in 2000 to roughly 1.2 million tonnes in 2011. Demand for graphite has been increasing by approximately 5 per cent per year since 2000 due to the continuing modernization of China, India and other emerging economies, resulting in strong demand from traditional end uses such as the steel and automotive industries. Graphite also has many important new applications such as lithium-ion batteries, fuel cells, and nuclear and solar power that have the potential to create significant incremental demand growth. There is roughly 10-20 times more graphite in a lithium-ion battery than there is lithium. Demand for graphite is expected to rise as electric vehicles and lithium battery technology are adopted.

Natural graphite comes in several forms: flake, amorphous and lump. Of the 1.2 million tonnes of graphite produced annually, approximately 40 per cent is of the most desirable flake type. China, which produces about 70 per cent of the world’s graphite, is seeing production and export growth leveling, and export taxes and a licensing system have been instituted. A recent European Commission study regarding the criticality of 41 different materials to the European economy included graphite among the 14 materials high in both economic importance and supply risk (Critical Raw Materials for the EU, July 2010).

Graphite prices have been increasing in recent months and over the last couple of years prices for large flake, high purity graphite (+80 mesh, 94-97%C) have more than doubled. Other public companies developing graphite projects in Canada include Northern Graphite Corp. with its Bissett Creek project in Ontario and Focus Metals Inc. with its Lac Knife project in Quebec. High-growth, high-value graphite applications require large-flake and high-purity graphite which is the prime exploration and development target at the Quatre Milles Property.

The Quatre Milles Property is road accessible and is located approximately 175 km northwest of Montreal and 17 km due north of the village of Sainte-Veronique, Quebec. The property consists of 28 contiguous claims totaling approximately 1,600 hectares.

The property was originally staked and explored by Graphicor Resources Inc. (“Graphicor”) in the summer of 1989 based on the results of a regional helicopter-borne EM survey. The underlying geology consists of intercalated biotite gneiss, biotite feldspar gneiss, marble, quartzite and calc-silicate lithologies of the Central Metasedimentary Belt of the Grenville Province.

Graphicor completed reconnaissance mapping and prospecting as well as ground geophysics and a 26 hole diamond drill program totalling 1,625 metres. The work identified several conductive trends in the central portion of the property and at least three, relatively flat lying graphitic beds. Three surface samples were collected and analyzed returning results of 14.16% Cgf, 18.06% Cgf and 20.35% Cgf. 23 of the initial 26 drill holes intersected graphite concentrations with a highlight of 8.07% Cgf over 28.60 metres in hole Q90-9. The highest individual assay was reported in hole Q90-10 reporting 15.48% Cgf over 0.50 metres.