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Regulus Discovers New Southwest Gold Stockwork Zone Rio

Regulus Discovers New Southwest Gold Stockwork Zone Rio Grande
Project-Salta, Argentina 
224.75 metres with 0.52 g/t Au and 0.18% Cu (0.84 g/t Au Eq) 
including 
112.05 metres with 0.67 g/t Au and 0.20% Cu (1.03 g/t Au Eq) 
VANCOUVER, BRITISH COLUMBIA -- (Marketwire) -- 10/25/12 -- Regulus
Resources Inc. ("Regulus" or the "Company") (TSX VENTURE:REG) is
pleased to announce results for an additional eight Southwest Zone
drill holes from the current drilling program at the Rio Grande
copper-gold-molybdenum project in Salta Province, Argentina. The key
hole in this release is RGR-12-100 which tested a distinct
geophysical IP/resistivity anomaly thought to represent a possible
intrusive center to the southwest of previously reported high grade
copper-gold mineralization in the Southwest Cu-Au sulphide zone
(RGR-11-86 with 257.3 m with 0.53% Cu and 1.20 g/t Au). This hole
intersected a zone of gold bearing stockwork quartz veining which
represents a new style of gold-dominant mineralization at the Rio
Grande Project with good potential for significant size. Key results
from this hole are summarized below and in Table 1. Drill hole
locations are noted in Figure 1. 


 
--  RGR-12-100 intersected: 224.75 m with 0.52 g/t Au and 0.18% Cu (Au Eq)
    including 112.05 m with 0.67 g/t Au and 0.20% Cu (Au Eq)
 
--  Contains individual 3 m long samples with up to 1.78 g/t Au and 0.44%
    Cu. 
 
--  Mineralization commences at a depth of 522.5 m but remains open
    laterally and upwards towards the surface.

 
The other seven holes presented in this release were drilled to test
for near-surface oxide gold mineralization in the vicinity of
previously reported RGR-11-088 (104.5 m with 0.66 g/t Au from the
surface). These holes encountered only a few narrow zones of lower
grade oxide gold mineralization as summarized in Table 1. 
John Black, President and CEO of Regulus commented as follows: "The
Rio Grande project continues to deliver pleasant surprises. The
significant interval encountered in drill hole RGR-12-100 represents
a new style of gold-dominant mineralization at Rio Grande and is
associated with well-developed stockwork
quartz-magnetite-pyrite-chalcopyrite veining typical of many large
gold-copper porphyry systems in the Andean Cordillera. We first saw a
hi
nt of this style of mineralization near the bottom of hole
RGR-12-99 and are quite pleased to see a longer and better grade
intercept in RGR-12-100. This new zone is located several hundred
metres to the southwest of the high-grade Southwest gold-copper
sulphide zone reported in holes RGR-11-086, RGR-12-099 and RGR-12-106
and it is not yet clear if it will be a separate zone or if the two
areas might be connected. The general spatial relation between the
two areas of mineralization can be seen in Figure 2. The next release
of drill results will focus on holes that further define the
high-grade Southwest copper-gold sulphide zone laterally and to
depth." 
Rio Grande Copper-Gold-Molybdenum Project Summary 
The Rio Grande Project is located approximately 55 km southwest of
the Taca Taca porphyry copper deposit of Lumina Copper and 11 km west
of the Lindero gold deposit of Mansfield Minerals in Salta Province,
northwestern Argentina. A NI 43-101 compliant resource estimate was
released for the project late last year (please refer to news release
of December 6th, 2011). 
The resource estimate, utilizing a 0.40% copper equivalent cut off
grade, is summarized below: 


 
   Indicated Resource: 55,257,862 tonnes with 0.342% Cu, 0.359 g/t Au, 4.38 
   g/t Ag                                                                   
   Inferred Resource: 101,088,174 tonnes with 0.303% Cu, 0.308 g/t Au, 4.45 
   g/t Ag                                                                   
                                                                            
   Indicated Resource: 637,025 oz Au, 7,787,342 oz Ag, 416,240,000 lbs Cu   
   Inferred Resource: 1,002,458 oz Au, 14,449,042 oz Ag, 674,405,000 lbs Cu 

 
Approximately 53% of the published resource is oxide mineralization,
35% is transitional oxide-sulphide mineralization and 12% is sulphide
mineralization.  
The current resource estimate utilized all drilling at Rio Grande
prior to 2010. The Southwest Zone was discovered in late 2011 and is
not included in the current resource estimate. Further drilling in
2012 has now revealed that several mineralization styles are present
in the Southwest Zone and these will be referred to as the a)
Southwest copper-gold sulphide, b) Southwest supergene copper, c)
Southwest oxide gold, d) Southwest molybdenum, and the newly
discovered e) Southwest gold quartz stockwork zones. The approximate
spatial relationship between these zones is illustrated in Figure 2
below.  
Results of 2012 Drilling To Date 
Twenty-six drill holes (22,802 m) have been completed to date in the
ongoing 2012 Rio Grande drilling program with additional drilling
currently in progress. The drilling has concentrated in the immediate
vicinity of the significant intercepts previously reported from drill
holes RGR-11-86 and RGR-11-88 in the Southwest zone of the Rio Grande
system (see Regulus news releases of December 14, 2011 and February
8, 2012). Results from the first five holes of the 2012 drilling
program have been previously released (August 14 and September 20,
2012) and results from an additional eight holes are presented here. 
The locations of drill holes presented in this release are indicated
on Figure 1. RGR-12-100, the principal hole of interest in this
release, is also displayed on drill section 613,350E in Figure 2
(Please also refer to the Regulus Resources website,
www.regulusresources.com for additional information about Regulus and
the Rio Grande Project). Additional description of the holes
presented in this release follows below. 


 
----------------------------------------------------------------------------
RGR-12-                           Au    Cu   Ag     Mo   Au    Cu Mineral   
 100         From     To Metres  g/t     %  g/t      %   Eq    Eq Zone      
----------------------------------------------------------------------------
TD =         7.00  23.00  16.00 0.33 0.07% 3.46 0.001%            Supergene 
 912.50 m     
----------------------------------------------------------------------------
            32.00  96.00  64.00 0.31 0.37% 2.56 0.001%            Supergene 
----------------------------------------------------------------------------
           146.00 176.00  30.00 0.09 0.32% 1.32 0.002%            Supergene 
----------------------------------------------------------------------------
           522.50 747.25 224.75 0.52 0.18% 0.50 0.001% 0.84 0.49% Primary   
----------------------------------------------------------------------------
        including                                                        
----------------------------------------------------------------------------
           522.50 634.55 112.05 0.67 0.20% 0.65 0.001% 1.03 0.60% Primary   
----------------------------------------------------------------------------
              and                                                           
----------------------------------------------------------------------------
           655.40 747.25  91.85 0.45 0.19% 0.36 0.001% 0.79 0.46% Primary   
----------------------------------------------------------------------------
RGR-12-                                                  Au       Mineral   
 101         From     To Metres   Au    Cu   Ag     Mo   Eq Cu Eq Zone      
 
----------------------------------------------------------------------------
TD =                                      No Significant Intervals to report
 447.50 m                                 
----------------------------------------------------------------------------
RGR-12-                                                  Au    Cu Mineral   
 103         From     To Metres   Au    Cu   Ag     Mo   Eq    Eq Zone      
----------------------------------------------------------------------------
TD =                                      No Significant Intervals to report
 436.50 m                                 
----------------------------------------------------------------------------
RGR-12-                                                  Au    Cu Mineral   
 104         From     To Metres   Au    Cu   Ag     Mo   Eq    Eq Zone      
----------------------------------------------------------------------------
TD =        10.00  22.00  12.00 0.22 0.02% 0.82 0.003%            Supergene 
 708.70 m    
----------------------------------------------------------------------------
            72.00 118.00  46.00 0.31 0.09% 0.43 0.004%            Supergene 
----------------------------------------------------------------------------
           426.00 471.00  45.00 0.27 0.30% 6.94 0.001% 0.92 0.53% Primary   
----------------------------------------------------------------------------
           498.50 518.00  19.50 0.30 0.23% 4.95 0.001% 0.79 0.46% Primary   
----------------------------------------------------------------------------
RGR-12-                                                  Au    Cu Mineral   
 108         From     To Metres   Au    Cu   Ag     Mo   Eq    Eq Zone      
----------------------------------------------------------------------------
TD =         5.00  11.00   6.00 0.90 0.19% 0.95 0.000%            Supergene 
 553.00 m     
----------------------------------------------------------------------------
           317.00 329.00  12.00 0.30 0.06% 1.43 0.001%            Supergene 
----------------------------------------------------------------------------
           395.00 416.00  21.00 0.25 0.22% 1.09 0.003% 0.67 0.39% Primary   
----------------------------------------------------------------------------
           485.00 521.00  36.00 0.26 0.21% 1.24 0.006% 0.68 0.40% Primary   
----------------------------------------------------------------------------
RGR-12-                                                  Au    Cu Mineral   
 110         From     To Metres   Au    Cu   Ag     Mo   Eq    Eq Zone      
----------------------------------------------------------------------------
TD =                                      No Significant Intervals to report
 528.00 m                                 
----------------------------------------------------------------------------
RGR-12-                                                  Au    Cu Mineral   
 112         From     To Metres   Au    Cu   Ag     Mo   Eq    Eq Zone      
----------------------------------------------------------------------------
TD =                                      No Significant Intervals to report
 595.50 m                                 
----------------------------------------------------------------------------
RGR-12-                                                  Au    Cu Mineral   
 114         From     To Metres   Au    Cu   Ag     Mo   Eq    Eq Zone      
----------------------------------------------------------------------------
TD =       109.00 129.00  20.00 0.36 0.16% 1.62 0.001%            Supergene 
 1405.50 m        
----------------------------------------------------------------------------
           325.00 391.00  66.00 0.56 0.26% 2.10 0.001% 1.05 0.61% Primary   
----------------------------------------------------------------------------
           407.00 429.00  22.00 0.33 0.17% 2.17 0.001% 0.67 0.39% Primary   
----------------------------------------------------------------------------
           439.00 449.00  10.00 0.33 0.10% 1.76 0.004% 0.56 0.33% Primary   
----------------------------------------------------------------------------
Table 1: Rio Grande Drill Results                                           
                                                                            
(i)Copper equivalent calculation uses US$2.50/lb Cu, US$1,000/Oz Au,        
US$18.00/Oz Ag and US$10.00/lb Mo and is not adjusted for metallurgical     
recoveries as these remain uncertain. The formula to calculate Cu equivalent
is Cu Eq. = (Cu x 1) + (Au x 0.5833) + (Ag x 0.0105) + (Mo x 4). Intercepts 
are reported as down-hole intercept lengths and may not necessarily         
represent true widths.                                                      

 
To view Figure 1, visit the following link:
http://media3.marketwire.com/docs/REG_Fig1.jpg 
To view Figure 2, visit the following link:
http://media3.marketwire.com/docs/REG_Fig2.jpg 
Drill Hole Descriptions 
RGR-12-100 was collared 125 m to the northwest of RGR-11-086 and
drilled in the opposite direction to test a distinct geophysical
IP/resistivity anomaly thought to possibly represent an intrusive
center related to the high-grade copper-gold sulphide mineralization
encountered in RGR-11-086. The uppermost portion of RGR-12-100
intersected several intervals of oxide copper and/or gold
mineralization typical of that found in the ring zone of the Rio
Grande system (best interval contained 64.00 m with 0.31 g/t Au and
0.37% Cu). The lower portion of the hole passed well outside the
southwest margins of the ring zone into weakly altered wallrock
before encountering increasing pyrite contents and a zone of
well-developed, sheeted to stockwork quartz veining commencing at
about 500 m downhole. 
The stockwork quartz veining is closely associated with gold and
lesser copper mineralization. Commencing at 522.50 m depth there is a
224.75 m interval with 0.52 g/t Au and 0.18% Cu. This broader zone of
mineralization includes internal dilution from a 20.85 m interval of
late mineral pyritic dyke that carries no gold or copper. The upper
portion of the broad zone of mineralization includes 112.05 m with
0.67 g/t Au and 0.20% Cu. Individual 3.00 m long sample intervals
contain up to 1.78 g/t Au and 0.44% Cu.  
The quartz veins form multidirectional sheeted to stockwork arrays
and are typically 0.2-1.0 cm in width with occasional veins to 5 cm
in width (see the photo if Figure 3 below). Veins are commonly gray
and banded with a vein assemblage of
quartz-magnetite-pyrite-chalcopyrite. Wallrock alteration consists of
secondary biotite and potassium feldspar. This style of veining is
very similar to that seen in many other large, gold-dominant porphyry
gold-copper deposits in the Andean cordillera (Cerro Corona, Lobo,
Cerro Casale, and the nearby Lindero deposit of Mansfield Minerals -
11 km to the southeast of Rio Grande). A distinctly later vein set
contains much higher contents of pyrite and does not appear to be
associated with the gold-copper mineralization. This later pyritic
vein set may also be associated with later chloritic and sericitic
alteration of the wallrock. 
To view Figure 3, visit the following link:
http://media3.marketwire.com/docs/REG_Fig3.jpg 
The hostrock for the Southwest stockwork gold zone comprises multiple
subvolcanic intermediate intrusive phases including several narrow 
dykes that appear to be most closely associated with the
mineralization. There are also late mineral dykes that are cut by
late barren pyritic veins but do not bear gold-copper mineralized
quartz veining. 
The remaining seven drill holes presented in this release were
drilled in the vicinity of drill hole RGR-11-088 to determine if
near-surface oxide gold mineralization found in this hole (104.5 m
with 0.66 g/t Au from the surface) had potential for a large
blanket-like body. The holes were drilled on approximate 100 m
centers surrounding RGR-11-088. Although all of the holes encountered
very strongly altered wallrocks, they only encountered a few narrow
intercepts of lower grade gold or copper-gold mineralization (see
Table 1), with the better results towards the west and south, in the
direction of the well-mineralized zone around drill hole RGR-11-086.
Work remains to better characterize the near-surface oxide gold from
hole RGR-11-088, but the potential for a large body of near-surface
mineralization has been significantly reduced. 
About Regulus Resources Inc. 
Regulus Resources Inc. (TSX VENTURE:REG) is a mineral exploration
company formed in December, 2010 in connection with the sale of
Antares Minerals Inc. to First Quantum Minerals Ltd. Regulus has been
exploring the Rio Grande Cu-Au-Ag porphyry project in Salta Province
of NW Argentina as a 50/50 joint venture partner with Pachamama
Resources and the two companies recently merged under the name of
Regulus Resources to consolidate a 100% interest in the project and
pursue an aggressive exploration program (see Regulus press releases
of May 11 and May 16, 2012). 
All of Regulus' exploration programs and pertinent disclosure of a
technical or scientific nature are prepared by, or under the direct
supervision of, Wayne Hewgill, P.Geo, and Regulus' COO, who serves as
the qualified person (QP) under the definitions of National
Instrument 43-101. 
The Rio Grande samples were analysed with the following methods: Au -
30 g FA with AA Finish, Cu - four acid digestion for trace Cu and
four acid digestion and AAS for ore grade Cu, 35 element Aqua Regia
ICP-AES.  
Regulus' security, chain of custody and quality control is described
on their website and can be reviewed at: http://www.regulusresources.
com/BestPractices/SamplingMethodologies.aspx. 
Forward Looking Information 
Certain statements regarding Regulus, including management's
assessment of future plans and operations, may constitute
forward-looking statements under applicable securities laws and
necessarily involve known and unknown risks and uncertainties, most
of which are beyond Regulus' control.  
Specifically, and without limitation, all statements included in this
press release that address activities, events or developments that
either Regulus expects or anticipates will or may occur in the
future, including management's assessment of future plans and
operations and statements with respect to the completion of the
anticipated drilling program and the completion of a NI 43-101
compliant resource estimate, may constitute forward-looking
statements under applicable securities laws and necessarily involve
known and unknown risks and uncertainties, most of which are beyond
Regulus' control. These risks may cause actual financial and
operating results, performance, levels of activity and achievements
to differ materially from those expressed in, or implied by, such
forward-looking statements. Although Regulus believes that the
expectations represented in such forward-looking statements are
reasonable, there can be no assurance that such expectations will
prove to be correct. Such risks and uncertainties include, but are
not limited to: the impact of general economic conditions in Canada
and Argentina, industry conditions including changes in laws and
regulations including adoption of new environmental laws and
regulations, and changes in how they are interpreted and enforced, in
Canada and Argentina, fluctuations in commodity prices and ability to
complete operations due to factors beyond Regulus' control. 
Although the forward-looking statements contained in this Press
Release are based upon assumptions which management believes to be
reasonable, Regulus cannot assure shareholders that actual results
will be consistent with these forward-looking statements. With
respect to forward-looking statements contained in this press
release, Regulus has made assumptions regarding: current commodity
prices and royalty regimes; timing of receipt of regulatory
approvals; availability of skilled labour; timing and amount of
capital expenditures; future exchange rates; the impact of increasing
competition; conditions in general economic and financial markets;
effects of regulation by governmental agencies; royalty rates; future
operating costs; and other matters.  
Accordingly, Regulus does not give any assurance nor make any
representations or warranty that the expectations conveyed by the
forward-looking statements will prove to be correct and actual
results may differ materially from those anticipated in the
forward-looking statements. Regulus does not undertake any obligation
to publicly update or revise any forward-looking statements other
than required by applicable securities law. 
Neither TSX Venture Exchange nor its Regulation Services Provider (as
that term is defined in policies of the TSX Venture Exchange) accepts
responsibility for the adequacy or accuracy of this release. 
Contacts:
Regulus Resources Inc.
John Black
President and CEO
+1 720 514-9036 or Mobile: +1-303 618-7797 
Regulus Resources Inc.
Wayne Hewgill, P.Geo
COO
+1 778 438-2481 or Mobile: +1 604 961-0033
www.regulusresources.com