Commerce Resources Corp. has completed additional metallurgical testing on its Upper Fir Tantalum-Niobium Project in British Columbia. The testing showed that the optimized flotation process developed in previous studies achieved similar recovery rates across different mineral compositions in the deposit. Over 90% of samples tested achieved tantalum recoveries over 96% and niobium recoveries over 92% using this process. An updated mineral resource estimate incorporating all drilling data is underway. The results continue to support the potential development of this project as a long-term source of tantalum and niobium.

1. Commerce Resources Corp. Updates Programs for the Upper Fir Tantalum-
Niobium Project, Blue River, British Columbia
Highlights
 Mineralogical variability studies show that the composites tested achieved similar recoveries
(i.e. both by weight and grades of niobium and tantalum) to the partially optimized rougher
flotation process established during the previous phase 1 and 2 metallurgical programs.
 Over 90% of the composites tested achieved rougher recoveries which exceeded 96%
tantalum and 92% niobium within the tantalum/niobium circuit only.
 The amount of tantalum and niobium metals reporting to the flotation feed is relatively
constant at about 81.4% for tantalum and 80.6% for niobium
 The Mineral Resource update underway at AMEC will include results of exploration in
2012, as well as 34 drill holes (totalling 8,715 m) of infill drilling completed in 2011 and not
included in the previous resource.
March 27, 2013 - Commerce Resources Corp. (TSXv: CCE, FSE: D7H, OTCQX: CMRZF)
(the “Company” or “Commerce”) is pleased to provide a further update on recent work
completed at its Blue River Project since release of the National Instrument (NI) 43-101
compliant Mineral Resource update (Commerce news release July 6, 2012) for the Upper Fir
Deposit. Newly completed mineralogical variability studies show that the partially optimized
flotation flow sheet which formed the base of the metallurgical analysis in the Preliminary
Economic Assessment (Commerce news release November 3, 2011), and which was further
optimized during Phase 2 test work (reported December 3, 3012) shows good applicability across
the range of mineralogies tested.
The geological, engineering, metallurgical and environmental programs carried out in 2012
provide broad support to the advancement of exploration and development at the Company’s
wholly owned Blue River Project, east-central British Columbia. The new metallurgical results
continue to strengthen the foundation of broadly based technical knowledge developed in 2012,
and after completion of the mineral resource update currently in progress by independent
consultants AMEC Americas Ltd. (“AMEC”), will be sufficient to support the initiation of a pre-
feasibility study (PFS).

2. “We are pleased with these new results from what has been a significant amount of work
accomplished in the past year. These metallurgical results provide additional upside to the
positive test work previously reported in the PEA, a major milestone in our progress to develop
the Upper Fir. The post-PEA metallurgical results reinforce Commerce’s belief that we are in
the process of building a very important long-term source of conflict free and ethical tantalum
which could potentially supply 10% of the current world’s market for the long term.” says Dave
Hodge, Commerce’s President. “We will be extremely interested in the upcoming resource
update from AMEC which will be based on all work to date.”
The Blue River Property is host to the Upper Fir Tantalum and Niobium Deposit, which was
discovered in 2002 and which has been the focus of the Company’s activities since 2005. In
fiscal 2012 Commerce spent approximately $3.8M on the Property.
Metallurgical Test Work in 2012
Metallurgical work in 2012 has continued to update and optimize the process flow sheet
described in the NI 43-101 compliant Preliminary Economic Assessment (“PEA”) study
completed by AMEC on the Blue River Project (effective date of September 29, 2011; see
Commerce news release of November 3, 2011). The process flow sheet for the recovery of the
tantalum and niobium described in the PEA was developed in 2011 based on Phase 1 studies.
In April 2012, Commerce commissioned Acme Metallurgical Ltd (“Acme Met”) of Vancouver,
BC to initiate a Phase 2 investigation. This was designed to follow-up the successful results of
the earlier program which had tested flotation as the preferred method to remove the larger
portion of fine slimes and carbonatite minerals early in the process. Subsequent process steps
could then focus on material containing Ta and Nb.
Phase 2 testing optimized the use of desliming and carbonate rejection flotation, as well as
chemical reagent dosages to increase the efficiency of rougher/cleaner Ta/Nb flotation. This
work enabled finalization of the process flow sheet developed in Phase 1 which was based on
composite samples BS-2F and BS 2G. All Phase 2 work was conducted on these same
composites and all tests were conducted at a grind size of 80% passing 130 microns. These
results were reported in a news release dated the 3rd of December 2012.
Mineralogical Variability Testing
A total of 767 samples of drill core rejects from the Upper Fir deposit were combined into thirty-
six composites (selected to represent five different end member mineralogies within the deposit)
and subjected to flotation testing. This variability testing, initiated in April 2012 and completed
in January 2013, had the primary objective of determining the composites’ response to the
partially optimized flotation procedure established during the Phase 1 and 2 metallurgical
programs completed in 2011 and 2012 and previously reported.

3. Key Areas of Variability Investigation and Results:
Desliming and Mass Rejection
 The majority of the composites are amenable to the standard one stage cyclone desliming
process with rejection of 17.2% of the weight as slimes, containing 7.2% of the tantalum
and 6.9% of the niobium. Variation of the weight rejected is minimal between
composites with no significant effect from grind sizes or mineralogy.
 The total carbonate mass rejection is proportional to the amount of carbonate and
phosphate materials in the feed, with the average weight of carbonate concentrate floated
and rejected for all composites being 53.2% of the mass, with losses of 11.4% for
tantalum and 12.5% of niobium. Metals losses were directly proportional to the weight of
concentrate removed and independent of head grades.
Carbonate Concentrate Cleaning
 Cleaning of the carbonate concentrate was not performed during this testing campaign,
however, the scavenger stage of flotation represented about 40% of the total weight
floated, containing about two thirds of the metal losses. This is indicative of mechanical
losses due to strong scavenging action and entrainment.
 It is strongly recommended that cleaning of the concentrate be kept in the flow sheet to
reduce these losses. Recycling the cleaner tails to the Ta:Nb flotation feed might account
for 2% to 6% of the metals in the feed.
Feed to Tantalum:Niobium Flotation
 Though the weight of material left after slimes and carbonate removal does vary with the
type of mineralogy, it overall averages 29.5%. The amount of metals reporting to Ta:Nb
flotation nevertheless remains fairly constant at about 81.4% for tantalum and 80.6% for
niobium. Losses of metals to that point are proportional to the weights removed and thus
statistically inversely proportional to head grades.
 Within the Ta:Nb rougher and cleaner flotation circuit only, over 90% of the composites
achieved rougher grade Ta:Nb recoveries which exceeded 96% for Ta and 92% for Nb.
Magnetic Separation
 The final stage of magnetic separation also increased the final concentrate grade with
minimal loss of the Ta and Nb minerals. This supports results from Phase 2 work in
which approximately 50% of the final concentrate mass was removed with minimal
Ta/Nb loss.
Acme Metallurgical Recommendations
Acme Met recommends that further optimization work be undertaken as follows:
 The carbonate flotation stage appears to require a lower dosage of the oleic acid collector
as tantalum and niobium minerals are likely trapped and entrained with the tight froth
generated by the over dosage of oleic acid.

4.  The balance of flotation reagents diamine acetate (Duomac T- as collector) and fluosilicic
acid (H2SiF6 as pH modifier/silicates depressant) in the Ta:Nb cleaning circuit should be
investigated as metals losses are mostly observed between pH 4 to 3.
 A fifth and sixth stage of cleaning should be investigated to achieve a grade of 35%
combined Nb-Ta oxides.
 Locked cycle tests should be completed to provide clear indication of reagents
consumption as each stage.
 Full assaying of final concentrate products, particularly for sulphur and rock-forming
elements, could provide additional information which would help orient further
investigations.
Upcoming Mineral Resource Update
A Mineral Resource Update and subsequent technical report which will incorporate all data from
2005 through 2012 is currently underway by AMEC with completion targeted for the second
quarter of 2013. This work will build from the previous Mineral Resource Update technical
report (effective date June 22, 2012) in which AMEC compared results from the 34 holes
totalling 8,715m drilled in 2011, after the closure of the resource database to the updated
resource model and found them to be reasonably consistent with the geology predicted by the
model.
2011 PEA Outcomes
The Preliminary Economic Assessment (“PEA) was prepared to define an overall proof of
concept for further development of the Blue River Project. The PEA (effective date September
29, 2011) indicated that the deposit can be developed economically as an underground mine and
recommended future studies to support a pre-feasibility level assessment of the project. The
assessment included geological and mineral resource modeling, preliminary mine planning, a
description of metallurgical test work and process design, a summary of environmental baseline
work to date, and estimates for capital and operating costs. As well, it determined the economics
to develop the project as an underground mine with process facility, and included an estimate of
the direct cash costs to produce tantalum contained in a technical grade oxide product.
Property
The Blue River Project is located near the village of Blue River, which is approximately 250 km
north of the city of Kamloops and approximately 90 km south of the town of Valemount. The
Project comprises 105,373 hectares (1,000 km2) of mineral claims. Power transmission lines,
rail, and paved and gravel roads are all adjacent to, or within the property boundaries. Transalta
Corp.’s 18 MW Bone Creek run-of-river hydroelectricity project near the project was
commissioned in June 2011.

5. NI 43-101 Disclosure
Ms. Jenna Hardy, M.Sc., P.Geo., Commerce Resources Corp., is a Qualified Person as defined
by National Instrument 43-101, read and approved the disclosure of the technical information in
this news release.
About Commerce Resources Corp.
Commerce Resources Corp. is an exploration and development company with a particular focus
on tantalum, niobium and rare metal deposits with potential for economic grades and large
tonnages. The Company is specifically focused on the development of its Upper Fir Tantalum
and Niobium Deposit in British Columbia and its Ashram Rare Earth Element Project in northern
Quebec.
For more information please visit the corporate website at http://www.commerceresources.com
or contact Investor Relations at 1.866.484.2700 or info@commerceresources.com.
On Behalf of the Board of Directors
COMMERCE RESOURCES CORP.
“David Hodge”
David Hodge
President and Director
Tel: 604.484.2700
Email: dhodge@commerceresources.com
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the
TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
Forward-Looking Statements
This news release contains forward-looking information which is subject to a variety of risks and uncertainties and
other factors that could cause actual events or results to differ from those projected in the forward-looking
statements. Forward looking statements in this press release include that our results will be sufficient to support the
initiation of a pre-feasibility study; that we are in the process of building a very important long-term source of
tantalum which could potentially supply 10% of the current world’s market for the long term; that we will be able to
enhance even further the quality of the resource; and that prices for our potential products are conservatively
estimated and may trend upwards. These forward-looking statements are based on the opinions and estimates of
management and its consultants at the date the information is disseminated. They are subject to a variety of risks

6. and uncertainties and other factors that could cause actual events or results to differ materially from those projected
in the forward-looking information. Risks that could change or prevent these statements from coming to fruition
include changing costs for mining and processing and their impact on the cut off value established; increased capital
costs; changing forecasts of mine production rates; the timing and content of upcoming work programs; geological
interpretations based on drilling that may change with more detailed information; potential process methods and
mineral recoveries assumption based on limited test work and by comparison to what are considered analogous
deposits that with further test work may not be comparable; the availability of labour, equipment and markets for the
products produced; market pricing for the products produced; and despite the current expected viability of the
project, conditions changing such that the minerals on our property cannot be economically mined, or that the
required permits to build and operate the envisaged mine can be obtained. The forward-looking information
contained herein is given as of the date hereof and the Company assumes no responsibility to update or revise such
information to reflect new events or circumstances, except as required by law.