Twin Domes

McEwen Mining is pleased to announce a new gold discovery, called Twin Domes, within the El Gallo Complex. Twin Domes is located approximately 14 kilometers (8.5 miles) west of El Gallo 1 and 2. Although there is minor evidence of small-scale mining, the majority of the discovery area is covered by agricultural land. Twin Domes was identified as a prospective target based on previous exploration that was completed by a predecessor company. High-grade gold mineralization has been identified from surface to a depth of 50 meters. The known length (or strike) of the high-grade is approximately 375 meters. Both core drilling and surface trenches were used to target the mineralization. Highlights from the recent drilling are included in the table below. 

Twin Domes Exploration Highlights

	From (m)	To (m)	Thickness (m)	Gold Grade (GPT)
TDX003	24.4	29.0	4.6	9.8
Including	26.7	27.8	1.1	37.2
TDX004	22.8	24.2	1.4	8.5
Including	23.7	24.2	0.5	15.5
And	27.0	27.5	0.5	12.1
TDX008	41.4	51.0	9.7	8.8
Including	47.3	49.2	2.0	29.5
TDT001	20.0	32.7	12.7	20.9
Including	27.9	29.6	1.7	112.9
TDT003	14.0	16.0	2.0	7.1

TDX = Core Drill Hole
TDT = Surface Trench

Currently 10 trenches are being completed over the length of the mineralization in order to gain a better understanding of 1) the nature of the high-grade, 2) the geology and 3) the orientation of the veins. This work, including final assays, is expected to be completed by the end of April. A core drill program is being planned in order to target the mineralization below 50 meters, which is the current limit of the known mineralization. In addition, McEwen Mining has completed an aeromagnetic survey over the discovery, which will be reassessed based on the new results.

The Company is planning to update its resource and mine plan in April 2013.

Lupita Vein

Drilling inside of El Gallo Phase 1 is focused on extending the mine life by exploring for additional mineralization laterally and at depth. Assay results since drilling re-commenced in June 2012 have been exceeding expectations. Highlights from recent drilling are included in the table below. There appears to be good potential to extend the mineralization at depth.

Lupita Vein Exploration Highlights

Hole	From (m)	To (m)	Thickness (m)	Gold Grade (GPT)
MLX-013	50.0	121.3	71.3	1.1
Including	76.1	81.0	4.9	6.6
Including	95.2	96.6	1.4	6.5
MLX-037	79.1	125.2	46.1	2.1
Including	94.2	99.2	5.0	9.9
MLX-041	61.7	83.5	21.8	2.9
Including	68.6	76.4	7.8	6.7
Including	73.4	74.6	1.3	24.3
MLX-042	159.3	163.6	4.4	10.9
MLX-044	91.5	135.8	44.4	1.3
Including	115.2	117.7	0.5	21.3
Including	134.1	134.6	0.5	16.3
MLX-054	103.1	114.9	11.8	7.4
Including	107.2	108.5	1.3	64.7

Mina Grande 

Mina Grande is located 15 km north of El Gallo Phase 1 (heap leach) and 10 km from Phase 2 (proposed mill site). Mina Grande currently has an inferred resource of 3.8 million tonnes grading 0.6 gpt gold and 23.5 gpt silver for a total of 74,000 ounces gold and 2.9 million ounces silver.

The objective of the recent drilling was to extend a high-grade gold shoot within the Mina Grande set of veins that was discovered early in 2012. The initial results from this vein returned encouraging results. New drilling has encountered additional high-grades extending the extent of the mineralization by 50 m. Highlights are shown in the table below.

Mina Grande Exploration Highlights

Hole	From (m)	To (m)	Thickness (m)	Gold Grade (GPT)	Silver Grade (GPT)
MGX-075	34.6	36.6	2.1	27.5	24.8
Including	34.6	35.6	1.1	44.1	37.1
MGX-082	16.8	17.4	0.7	24.8	21.2
MGX-087	59.2	63.2	4.0	11.1	18.1
Including	59.2	60.2	1.0	16.8	16.2
Including	62.4	63.2	0.8	26.9	42.5
MGX-090	113.7	114.0	0.3	6.1	17.0
And	115.3	115.6	0.3	7.4	19.5
MGX-091	119.7	120.1	0.4	6.9	26.7
MGX-093	45.6	53.1	7.5	10.6	21.1
Including	49.1	50.3	1.2	49.0	53.1
And	139.9	140.5	0.6	9.2	13.4
MGX-097	58.6	59.9	1.3	18.6	17.8

The El Gallo technical information on this page was derived from the news release titled "New High-Grade Gold Discovery at El Gallo Complex" released on April 2, 2013 by McEwen Mining. To access the news release click here.

The El Gallo technical information on this page was derived from the news release titled "El Gallo Complex Exploration Update" released on November 6, 2012 by McEwen Mining. To access the news release click here.

The El Gallo technical information on this page was derived from the news release titled " More Drilling Success at El Gallo Phase 1 Production Area Plus Additional Zinc, Silver & Lead Intercept" released on October 11, 2012 by McEwen Mining. To access the news release click here.

Additional El Gallo technical information on this page was derived from the news release titled "McEwen Mining Discovers Additional Gold at El Gallo Phase 1 Production Area" released on July 19, 2012 by McEwen Mining. To access the news release click here.?For additional technical information on El Gallo, see a report titled "El Gallo Complex Phase 2 Project, NI 43-101 Technical Report Feasibility Study, Mocorito Municipality, Sinaloa, Mexico" with an effective date of September 10, 2012. The report was prepared by Stanley Timler, P.E., John Read, C.P.G., Michael Hester, FAusIMM, Dawn Garcia, P.G., C.P.G., Richard Kehmeier C.P.G., Brian Hartman, P.Geo, Aaron McMahon, P.G. all of whom, but John Read, are considered independent of the Company as defined in Section 1.5 of NI 43-101. To access the report click here.

All resource and reserve estimates reported by McEwen Mining Inc. are calculated in accordance with 43-101 and the Canadian Institute of Mining and Metallurgy Classification system. These standards differ significantly from the requirements of the U.S. Securities and Exchange Commission. Mineral resources which are not mineral reserves do not have demonstrated economic viability.