VANCOUVER, BRITISH COLUMBIA--(Marketwire - 05/17/11) - Hathor Exploration Limited (TSX:HAT - News) is pleased to announce the first mineral resource estimate for the East Zone of the Roughrider Uranium Deposit located in the Athabasca Basin, Saskatchewan. The estimate identifies 30 M lbs grading 11.58 % U3O8, and doubles the overall size of the Roughrider deposit, as currently defined.Table 1 shows the Mineral Resource Statement ("MRS") for the East Zone at the Roughrider Uranium Deposit, as determined by SRK Consulting (Canada) Inc. ("SRK"), using the ordinary kriging (OK) method. Table 2 below lists the global model quantities using various cut-off grades. Table 3 shows the total resource for the Roughrider Uranium Deposit; this total does not include the recently discovered Far East Zone. Graph 1 is a grade tonnage curve, which in combination with Table 2, illustrates that the East Zone is relatively insensitive to cut off limits up to a value 1.00 % U3O8.
Table 1: Mineral Resource Statement for the East Zone, Roughrider Deposit,
Quantity Grade Contained
U3O8 As Co Cu Mo Ni Se U3O8
Category (Tonnes) (%) (%) (%) (%) (%) (%) (ppm) (million lb)
Inferred 118,000 11.58 0.02 0.01 0.86 0.10 0.02 26.65 30,130,000
(i)Mineral resources are not mineral reserves and do not have demonstrated
economic viability. All figures are rounded to reflect the relative
accuracy of the estimates. Reported at a cut-off of 0.4 percent U3O8 based
on an underground mining scenario, metallurgical recovery of 98 percent,
and metal prices of US$80.00 per pound of U3O8.
Table 2: Global Model Quantities and Grade
Estimates,East Zone, Roughrider Uranium
Cut-Off Grade Contained
U3O8 Quantity U3O8 U3O8
(%) (Tonnes) (%) (lb)
0.10 119,096 11.48 30,140,000
0.30 118,757 11.51 30,130,000
0.40 118,034 11.58 30,130,000
0.50 116,751 11.70 30,110,000
0.80 112,308 12.14 30,060,000
1.00 108,950 12.49 30,000,000
3.00 88,970 14.88 29,190,000
(i)The reader is cautioned that the figures in this table should not be
misconstrued with a Mineral Resource Statement. The figures are only
presented to show the sensitivity of the block model estimates to the
selection of cut-off grade.
Table 3: Total resources, Rougher Uranium Deposit
Mineral Quantity U3O8 U3O8
Zone Footnotes Category (Tonnes) (%) (million lb)
East Zone 1,3,4 Total Inferred 118,000 11.58 30.130
West Zone 2,3,5 Total Indicated 394,200 1.98 17.207
West Zone 2,3,5 Total Inferred 43,600 11.03 10.602
(1) Cut-off of 0.4 percent U3O8 based on an underground mining scenario, (2)
Cut-off of 0.05 percent U3O8 based on an open pit, using all material above
200 m elevation, (3) Metallurgical recoveries of 98 percent and metal prices
of US$80.00 per pound of U3O8, (4) Disclosed in this news release, (5)
Disclosed in news release dated Nov. 29, 2010.
Geological FrameworkThe East Zone is the middle of four zones currently identified at the Roughrider Uranium Deposit, as shown in Figure 1.The resource model for East Zone was developed using data from 21 drill holes completed between September 2009 and September 2010 (Figure 2). The surface projection has a surface trace approximately 120 m long in a north-easterly direction, which corresponds to a down-dip length of approximately 125 m. The East Zone is a series of stacked, parallel lenses (greater than 0.5 % U3O8) that collectively dip moderately to the north-east (Figure 3). The mineral lenses are separated by intervals of weakly mineralized or non-mineralized rock (less than 0.05 % U3O8). The contacts between these zones are sharp. Unlike the West Zone, the mineral lenses are not uniformly mantled by a rim of low grade mineralization. As shown in Figure 3, there is abundant low grade mineralization intersected in drill core which is not included in the mineral lenses of the current resource model, and which represents additional resource potential.As shown on the cross sections in Figure 4 and Figure 5, the lenses at East Zone span an aggregate thickness of up to 40 - 50 m, with mineralization spanning a vertical extent of up to 80 - 100 m, starting at approximately 250 m depth from surface, and some 30-50 m below the unconformity.As shown in the three dimensional model for the overall Roughrider Uranium deposit in Figure 6, the East Zone is positioned along-strike but slightly deeper than the West Zone. At East Zone, mineralization is hosted within basement rocks of both the Wollaston Group (pelitic gneisses, graphitic pelitic gneiss) and the Hanging Wall Wedge (granitic gneiss and granites). Overall, the Roughrider uranium system developed atop the Midwest Dome of Archean granitic gneiss, as shown in the 3-D model in Figure 7.Mineral Resource StatementThe Mineral Resource Statement for Roughrider East Zone was constructed by SRK Consulting (Canada) Inc. A completed technical report prepared following Canadian Securities Administrators' National Instrument 43-101 will be available on SEDAR within 45 days of this News Release.The boundaries for uranium mineralization were modelled by SRK based on Hathor sectional interpretations for seven high grade zones and wireframe grade shells generated with Leapfrog software by SRK. The Leapfrog grade shells were generated using a 0.5 % U3O8 threshold. SRK used both the Hathor interpretation and Leapfrog shells to generate a wireframe outline of uranium mineralization (greater than 0.5 % U3O8). All interpreted sections strings were snapped to drill hole intersections where possible.The database used to evaluate mineral resources for the Roughrider East Zone consists of twenty-one diamond drill holes completed between September 2009 and September 2010. The database comprises approximately 368 sample intervals assayed for U3O8 and other metals (including arsenic, cobalt, copper, molybdenum, nickel and selenium), and forty-six specific gravity measurements.All assay intervals within the wireframe solids were composited to 0.5 metre to provide common support for analysis and estimation. Ninety one percent of all assays had sample lengths of 0.5 metres. SRK evaluated the impact of high grade composite outliers in each zone using cumulative probability plots, histograms and examining the spatial distribution of higher grades with respect to other drill holes and adjacent composites. SRK concludes that no significant outliers are present in the database because high grades above the 95th to 98th percentiles for each resource domain are supported by adjacent composites or composites in nearby drill holes with grades ranging from 2.00 to 40.0 % U3O8.Normal scores variograms were used to model the spatial distribution of U3O8. A single variogram was developed for the combined zones, as each zone contains too few composites for analysis. Variogram analysis was not conducted on potentially deleterious elements. There is insufficient specific gravity data for variogram analysis. The U3O8 variogram is orientated parallel to the general strike and dip-direction of the resource domains. Variogram model ranges (second structure) are 30m by 30m by 9m in the strike, dip direction and normal directions respectively. The U3O8 variogram model was assumed for the estimation of potentially deleterious elements and specific gravity excluding domains 4, 5 and 7.
Table 4: Summary of Variogram Model Parameters.
Rx Ry Rz Z Y
Variable Domain Zone C0 CC Model (m) (m) (m) Axis Axis Comments
U3O8% All All 0.20 0.15 nential 15 15 3 130 45 Scores
A sub-blocked model was generated using Datamine Studio 3. The block model coordinates are based on the local UTM grid (NAD 83, Zone 13). The parent block size is 4.0 by 4.0 by 2.0 metres in the X, Y and Z directions respectively. The estimation strategy consists of estimating U3O8, potentially deleterious metals (arsenic, cobalt, copper, molybdenum, nickel and selenium) and specific gravity into a block model informed from composite data and constrained by seven resource domains. Specific gravity was not estimated for Domains 4, 5 and 7. Domains 4 and 5 have only two and four composites, respectively and specific gravity was not measured on core samples from Domain 7.U3O8 grades were estimated using three estimation runs using ordinary kriging informed from composite data from each domain, separately. The first estimation run is based on a search ellipse with ranges equal to the largest variogram model structure. The second run considers a search ellipse equal to twice the variogram ranges, while for the third estimation run the search ellipse was generally inflated to four times the variogram ranges. The bulk of blocks are estimated by the first run. The second and third estimation runs add only about ten and twelve percent more material, respectively to ensure that all blocks in the resource domains are estimated. Estimation of specific gravity using composites provides the most reasonable results maintaining the variability of the original composites. Specific gravity was estimated using an inverse distance function. For Domain 4 the average of two specific gravity composites was (2.14) was assigned to all blocks of that domain. Blocks from Domain 5 were all assigned as specific gravity value of 2.23, the only data available for that domain. The average of all specific gravity composites was assigned to all blocks for Domain 7 (2.74). Only parent blocks were estimated. Sub-blocks were all assigned parent block values. Potentially deleterious elements (arsenic, cobalt, copper, molybdenum, nickel and selenium) were estimated using ordinary kriging. Variogram models for U3O8 were assumed for these metals. The same estimation parameters as U3O8 were used for estimating these elements.Estimates were verified by conducting checks on Zone 2. Verification procedures included visual examination of block grades to drill hole composites, and comparing estimated grades at zero cut-off to nearest neighbour estimates and declustered means for each zone. All validation checks confirm that the block estimates are appropriate and reflect the underlying borehole sampling data.Mineral resources for the Roughrider Uranium East Zone have been classified according to the "CIM Definition Standards for Mineral Resources and Mineral Reserves" (December, 2005) by G. David Keller, P. Geo. (APGO#1235) and Sebastien Bernier P.Geo. (APGO#1847) both "independent qualified person" as defined by National Instrument 43-101. After review, SRK considers that all modelled blocks in the Roughrider East Zone should be classified as Inferred within the meaning of CIM definitions because the confidence in the estimates is insufficient to allow the meaningful application of technical and economic parameters or to enable an evaluation of economic viability worthy of public disclosure and justify an Indicated classification. Additional infill drilling and sampling is required to support a higher classification. It cannot be assumed that all or any part of an Inferred mineral resource will be upgraded to an Indicated or Measured mineral resource as a result of continued exploration.Midwest Northeast PropertyThe Midwest Northeast Property is within the main uranium-producing eastern corridor of the Athabasca Basin. The Property comprises 3 mineral leases covering 543 ha. Infrastructure is excellent. The Property is connected to Highway 955 by a 6 km winter road. The property is 8.5 km north of the community of Points North and the Points North commercial airport, the main service hub for northeastern Saskatchewan. The Property is within 25 km of operating uranium mine, mill and tailings facilities established at Rabbit Lake and McClean Lake during the past 35 years of production in the Athabasca.Terra Ventures Inc. owns a qualified 10% interest in the largest claim on the Property, carried to the completion of a positive feasibility study and announcement of intent for commercial production. Terra and Hathor recently announced (May 9, 2011) a definitive Plan of Arrangement, which remains subject to a number of conditions including, but not limited to, receipt of all regulatory, court and shareholder approvals, and will result in consolidation of 100% ownership of the Roughrider uranium deposit.Alistair McCready, Ph.D., P.Geo., Hathor's V.P. Exploration with responsibility for all of Hathor's exploration in Saskatchewan, and Michael Gunning, Ph.D., P.Geo., Hathor's Chief Executive Officer, are Qualified Persons as defined by National Instrument 43-101 and have reviewed and approved the technical disclosure contained in this news release.Dr. Michael H. Gunning, President & CEOHathor Exploration LimitedTo view the seven images and one graph associated with this release, please click the following link: www.hathor.ca/s/2011RROM.asp.This press release contains "forward-looking information" within the meaning of applicable Canadian securities legislation. Such forward-looking information concerns Hathor's anticipated operations in future periods, planned exploration and development of its properties, and plans related to its business and other matters that may occur in the future. This information relates to analyses and other information that is based on expectations of future performance and planned work programs. Statements concerning mineral resource estimates may also be deemed to constitute forward-looking information to the extent that they involve estimates of the mineralization that will be encountered if a mineral property is developed. Forward-looking information is subject to a variety of known and unknown risks, uncertainties and other factors which could cause actual events or results to differ from those expressed or implied by the forward-looking information, including, without limitation: exploration hazards and risks; risks related to exploration and development of natural resource properties; uncertainty in Hathor's ability to obtain funding; precious and base metal price fluctuations; recent market events and conditions; risks related to the uncertainty of mineral resource calculations and the inclusion of inferred mineral resources in economic estimation; risks related to governmental regulations; risks related to obtaining necessary licenses and permits; risks related to Hathor's business being subject to environmental laws and regulations; risks related to Hathor's mineral properties being subject to prior unregistered agreements, transfers, or claims and other defects in title; risks relating to competition from larger companies with greater financial and technical resources; risks relating to Hathor's inability to meet its financial obligations under agreements to which it is a party; ability to recruit and retain qualified personnel; and risks related to Hathor's directors and officers becoming associated with other natural resource companies which may give rise to conflicts of interests. This list is not exhaustive of the factors that may affect Hathor's forward-looking information.Should one or more of these risks and uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described in the forward-looking information. Hathor's forward-looking information is based on the reasonable beliefs, expectations and opinions of management on the date the statements are made and Hathor does not assume any obligation to update forward-looking information if circumstances or management's beliefs, expectations or opinions change, except as required by law. For the reasons set forth above, investors should not place undue reliance on forward-looking information. For a complete discussion, please refer to Hathor's Annual Information Form and unaudited financial statements and MD&A for its most recently completed financial year on SEDAR at www.sedar.com.Neither the TSX nor its Regulation Services Provider (as that term is defined in the policies of the TSX Exchange) accepts responsibility for the adequacy or accuracy of this release.