International Minerals Updates Reserve and Resource Estimates at Pallancata Silver Mine

International Minerals Updates Reserve and Resource Estimates at Pallancata 
Silver Mine 
SCOTTSDALE, AZ -- (Marketwire) -- 03/14/13 --  International Minerals
Corporation (TSX: IMZ) (SWISS: IMZ) reports updated annual mineral
reserve and resource estimates for the Pallancata silver mine in
Peru, jointly owned by IMZ (40% interest) and Hochschild Mining plc
("Hochschild", 60% interest), based on information supplied by
Hochschild, the mine operator, as at December 31, 2012.  
The updated mineral resource and reserve estimates summarized below
(and detailed in Table 1) are calculated using a marginal cut-off
grade of 128 grams per tonne ("g/t") silver equivalent (based on a
51:1 silver-to-gold ratio), which reflects a marginal cut-off value
of approximately $60 per tonne using metal prices of $20 per ounce of
silver and $1,200 per ounce of gold. 
Proven and Probable ("P&P") Reserve Estimates (on a 100% basis): 


 
--  28.8 million ounces ("ozs") silver and 136,500 ozs gold (~35.7 million
    silver equivalent ozs).
--  3.27 million tonnes ("Mt") at an average grade of 273 g/t silver and
    1.3 g/t gold.

  
The updated reserve estimate represents a year-over-year decrease of
approximately 5% in tonnage and 10% in contained ounces for both
silver and gold. In addition to depletion of reserves from mine
production during 2012, this decrease in new reserves is due
primarily to (a) the lag/delay in mine development required to
upgrade Measured and Indicated ("M&I") resources to P&P reserves,
with 21,000m of underground development being completed in 2012
compared to the planned 28,000m; and (b) narrower veins resulting in
an increase in dilution, which for estimation purposes is assigned
zero metal content.  
Measured and Indicated Resource Estimate (on a 100% basis and
including P&P Reserves): 


 
--  51.0 million ozs silver and 240,000 ozs gold (~63.1 million silver
    equivalent ozs).
--  4.5 Mt at an average grade of 352 g/t silver and 1.7 g/t gold.

  
The updated M&I mineral resource estimate represents a year-over-year
decrease of approximately 10% in tonnage and 15% in contained ounces
for both silver and gold.  
Inferred Resource Estimate (on a 100% basis): 


 
--  36.2 million ozs silver and 151,000 ozs gold (~43.8 million silver
    equivalent ozs).
--  3.3 Mt at an average grade of 338 g/t silver and 1.4 g/t gold.

  
This updated inferred resource estimate represents a year-over-year
increase of approximately 19% in tonnage and 15% in contained silver
ounces and 27% in contained gold ounces.  
Discussion and Details of Resource and Reserve Estimates 
Commenting on the updated resource and reserve estimates, Stephen
Kay, President/CEO of IMZ said, "The Pallancata Mine has now produced
almost 40 million ounces of silver and 147,000 ounces of gold
(approximately 48 million silver equivalent ounces at current metal
prices) since start-up in late 2007 and the ongoing discovery of new
mineral resources at Pallancata continues to replace the mine
production. Continued aggressive surface and underground drilling
programs, combined with underground development aimed at both
upgrading the existing resources and defining new mineral resources,
are planned in 2013 to ensure that the Pallancata Mine will continue
in production for many years to come." 
In 2012, the Pallancata Mine produced 7.44 million ounces of silver
and 26,231 ounces of gold. IMZ estimates that the mine will produce
approximately 7.4 million ounces of silver and 26,000 ounces of gold
during calendar year 2013, with 40% of those ounces attributable to
IMZ.  
Table 1: Pallancata Mine - Mineral Reserve and Resource Estimates
(Effective date of Dec 31, 2012) at a Marginal Cut-off grade of 128
g/t Silver Equivalent, using a 51:1 Silver-to-Gold Ratio 


 
-----------------------------------------------------------------
-----------
                                                   100%     IMZ 40%  IMZ 40%
                     Average Average 100% Basis   Basis    Attribu- Attribu-
                      Grade   Grade   Contained Contained    table    table 
Reserve                (g/t    (g/t    Silver      Gold     Silver    Gold 
 Category    Tonnes  silver)  gold)    Ounces     Ounces    Ounces    Ounces
----------------------------------------------------------------------------
Proven                                                                      
 Reserves  2,221,000   276     1.3   19,683,000   94,000   7,873,000  38,000
----------------------------------------------------------------------------
Probable                                                                    
 Reserves  1,052,000   269     1.3    9,090,000   43,000   3,636,000  17,000
----------------------------------------------------------------------------
Total                                                                       
 Reserves  3,274,000   273     1.3   28,773,000  137,000  11,509,000  55,000
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
                                                   100%     IMZ 40%  IMZ 40%
                     Average Average 100% Basis   Basis    Attribu- Attribu-
                      Grade   Grade   Contained Contained    table    table 
 Resource              (g/t    (g/t    Silver      Gold     Silver    Gold 
  Category   Tonnes  silver)  gold)    Ounces     Ounces    Ounces    Ounces
----------------------------------------------------------------------------
Measured                                                                    
 Resources 3,308,000   358     1.7   38,045,000  179,000  15,218,000  71,700
----------------------------------------------------------------------------
Indicated                                                                   
 Resources 1,192,000   338     1.6   12,955,000   61,000   5,182,000  24,300
----------------------------------------------------------------------------
Total                                                                       
 Measured                                                                   
 and                                                                        
 Indicated                                                                  
 Resources 4,501,000   352     1.7   51,000,000  240,000  20,400,000  96,000
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
Inferred                                                                    
 Resources 3,335,000   338     1.4   36,191,000  151,000  14,476,000  60,000
----------------------------------------------------------------------------
                                                                            

 
1.  Measured and Indicated Resources include Proven and Probable Reserves.
    CIM definitions were complied with for mineral resources and reserves. 
2.  Metal prices: $20.00/oz for silver and $1,200/oz for gold. 
3.  The estimated reserves include 4% for ore losses and 29% for dilution
    assigned using zero grade. 
4.  The estimated mineral resources that are not mineral reserves do not
    have demonstrated economic viability. 
5.  Numbers have been rounded in all categories to reflect the precision of
    the est
imates. 
6.  The mineral resources were estimated using ordinary kriging for the
    major vein units and inverse distance to the power of three for
    peripheral veins. 
7.  The 51:1 silver gold ratio is determined by using a combination of metal
    prices, metallurgical recoveries, and cost of sales. 
8.  Contained metal in estimated reserves remains subject to metallurgical
    recovery losses. 
9.  There are no known risks that could materially affect the mineral
    resources and reserves. 

 
Hochschild's data and methodology have been reviewed by IMZ's VP
Corporate Development, Nick Appleyard, for mineral resources and VP
Special Projects, Alan Matthews, for mineral reserves. Both are
Qualified Persons as defined by National Instrument 43-101. 
Hochschild Mining plc does not accept any responsibility for the
adequacy or inadequacy of the disclosure made in this news release
and any such responsibility is hereby disclaimed in all respects. 
About International Minerals 
In addition to the Pallancata Mine, IMZ also owns a 40% interest in
the development-stage Inmaculada gold-silver project in Peru, also
partnered with Hochschild. Inmaculada is scheduled to be in
production in the second half of 2014 and projected to produce
approximately 124,000 ounces of gold and 4.2 million ounces of silver
annually on a 100% basis. The estimated mineral resources and
reserves at the Inmaculada project have not yet been updated since
the feasibility study of January 2012 because the majority of
post-feasibility study drilling so far has focused on exploration
drilling to encounter new veins and not in-fill drilling required to
delineate further mineral resources. 
IMZ also owns a 100% ownership interests in advanced-stage gold
projects in Nevada (Goldfield and Converse) and is in the process of
selling its interests in its gold assets in Ecuador (Rio Blanco 100%
interest and Gaby approximately 60% interest). 
IMZ is listed on the Toronto Stock Exchange (since 1994) and the
Swiss Stock Exchange (since 2002).
 All dollar amounts refer to
United States Dollars. 
Cautionary Statement:
 Some of the statements contained in this
release are "forward-looking statements" within the meaning of
Canadian securities law requirements. Such forward-looking statements
involve known and unknown risks, uncertainties and other factors that
may cause our actual results, performance or achievements to differ
materially from the anticipated results, performance or achievements
expressed or implied by such forward-looking statements.
Forward-looking statements in this release include statements
regarding estimates of reserves and resources and anticipated
production results. Factors that could cause actual results to differ
materially from anticipated results include risks and uncertainties
such as: risks of estimating mineral resources and reserves,
variances between mineral reserves and actual mineral production,
operating risks and other risks and uncertainties detailed in the
Company's Annual Information Form for the year ended June 30, 2012,
which is available at www.sedar.com under the Company's name. The
Company disclaims any intention or obligation to update or revise any
forward-looking statements, whether as a result of new information,
future events or otherwise.  
For additional information, contact: 
In North America: 
Paul Durham, Vice President Corporate Relations 
Tel: +1 203 883 8358 
In Europe: 
Oliver Holzer
Marketing Consultant
+41 44 853 00 47 
Renmark Financial Communications:
Christine Stewart 
+1-416-644-2020  
Robert Thaemitz 
+1-514-939-3989 
E-mail: Information@intlminerals.com
Internet Site: http://www.intlminerals.com 
 
 
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