Castillian Resources Corp.

Castillian Resources Corp.

July 10, 2007 08:30 ET

Castillian Resources Expands Mangabal South Nickel-Copper Sulphide Deposit and Doubles the Number of Diamond Drills

TORONTO, ONTARIO--(Marketwire - July 10, 2007) - Castillian Resources Corporation (Castillian) (TSX VENTURE:CT) announces the results of five (5) additional drill holes on the Mangabal South Deposit in Brazil (see table below).

David Gower, P.Geo., President & CEO stated that "We are excited about the results at the Mangabal South Deposit to date. The deposit remains open and the best intersections to date are in deeper holes, which we are currently followed up. Drilling indicates there is good continuity within the deposit. In addition to the results released to date, drill hole CRMS-07-21, which is currently the hole drilled farthest down plunge, is well mineralized over a 33 meter interval (assays are pending) and confirms that the deposit remains open for further significant expansion at shallow depths. Based on this drill hole, we believe that the deposit extends at least an additional 100 meters down plunge to the southwest from hole CRMS-07-013 (20.1 meters grading 1.08% nickel, 0.43% copper, 0.04% cobalt - see release dated May 16, 2007), the previous deepest intersection. Further, the shallow plunge of the deposit results in all of the mineralization intersected so far occurring within 120 meters vertical depth, which can provide a significant advantage both in terms of development time and cost to access the mineralization." Please see Figure 1 for pierce point locations.

Castillian has commissioned two additional diamond drills from a second contractor, increasing the number of drills on the Property to four. This will accelerate the drill campaign on the Mangabal South Deposit in order to determine the limits of the deposit and complete a resource calculation as early as possible. In addition to the deposit, numerous high priority airborne EM targets are being drilled and will be reported on in a separate release as results become available.

The drilling to date demonstrates that the Mangabal South Deposit has continuity along its plunge for at least 400 meters (Figure 1) and remains open for further expansion.

Results for drill holes CRMS-07-012 and CRMS-07-015 to 018 are summarized in the following table (see releases dated May 16 and April 24, 2007 for previously released drill results):

DDH# (meters) (meters) (meters) Ni% Cu% Co% Comment

CRMS-07-012 81.10 95.00 13.90 0.49 0.20 0.02
incl. 81.10 85.25 4.15 1.03 0.34 0.03
CRMS-07-015 45.50 54.00 8.50 0.52 0.15 0.02
incl. 47.50 49.50 2.00 1.39 0.17 0.04
CRMS-07-016 136.00 150.50 14.50 0.29 0.19 0.01

Vertical Drill
CRMS-07-017 37.00 50.00 13.00 0.67 0.13 0.02 Hole(i)
incl 37.00 40.30 3.30 1.38 0.14 0.04
and 46.10 50.00 3.90 0.81 0.23 0.03
incl 48.20 50.00 1.80 1.49 0.41 0.05

Vertical Drill
CRMS-07-018 53.50 80.40 26.90 0.65 0.37 0.02 Hole(i)
incl 69.90 80.40 10.50 1.01 0.43 0.04
incl 72.60 78.85 6.25 1.21 0.29 0.04
incl 71.25 73.60 2.35 2.00 0.22 0.07
incl 77.80 78.85 1.05 1.93 0.36 0.06

(i) Note: A number of vertical drill holes will be drilled to properly position the upper and lower contacts of the deposit to ensure an accurate block model during the resource calculation. It is estimated that true width is approximately 60% of core length for intersections from vertical drill holes. All other drill holes are drilled at an angle such that core length and true width are expected to be similar.

Quality Control

The company employs a QA/QC protocol on all aspects of the analytical procedures. Core samples are sawn and one half of the NQ core is restored to the core box for future reference and one half of the core is sent for analysis. Samples are taken in approx. 1.0-metre intervals or less. Sample preparation is completed at the ALS-Chemex preparation lab at Goiania, Brazil and assayed at ALS-Chemex lab in Vancouver, Canada or SGS Lakefield Lab in Belo Horizonte, Brazil using multi-acid digest/ ICP-AES and AAS techniques. A blank sample is inserted every 40th sample and standard samples representing a range of grades are inserted at intervals of 1 in 20 samples. Five percent of pulps are re-analysed at SGS Laboratory Services in Belo Horizonte, Brazil or ALS Chemex Lab in Vancouver, Canada. This is the same QA/QC protocol that was employed by Falconbridge (now Xstrata) in operating the project.

The Quality Control and all aspects of the exploration program are supervised by Castillian Exploration Manager, Joel Hrominchuk, P.Geo., who is a Qualified Person as defined under National Instrument 43-101. Mr. Hrominchuk has reviewed this press release.

About Castillian Resources

Castillian Resources Corp. is a Canadian mineral exploration company listed on the TSX Venture Exchange under the symbol CT with approximately 84 million shares issued and outstanding. Castillian is partnered with Xstrata Nickel to explore the approximately 155,000 ha Mangabal nickel-copper project in Brazil. The company is earning an interest in the Las Aguilas Nickel-Copper-PGM Project in Argentina from Marifil Mines Ltd. and has the right to purchase a 100% interest in the Kagera Project which comprises over 1,600 square kilometers in the highly mineralized Kabanga Nickel Belt in Tanzania and rights to acquire 90% of the Pederson deposit, an advanced gold exploration project in Bolivia which is currently under force majeure.

Forward Looking Statements

This document may contain or refer to forward looking information based on current expectations. Forward-looking statements are subject to significant risks and uncertainties, and other factors that could cause actual results to differ materially from expected results. These forward-looking statements are made as of the date hereof and we assume no responsibility to update or revise them to reflect new events or circumstances.

To view Figure 1: Vertical Longitudinal Projection Mangabal South Deposit, please visit the following link:

The TSX Venture Exchange does not accept responsibility for the adequacy or accuracy of this release.

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