Projects

El Dorado

In June 2006, Pacific Rim issued the results of an updated resource estimate for the El Dorado Project. The impetus for the updated resource estimate was primarily to quantify the gold and silver ounces at the South Minita deposit, the subject of an 18-month long definition drilling program at El Dorado that was completed in the spring of 2006. In July 2006 the El Dorado resource estimate was updated again to include inferred resources that were estimated for the Nance Dulce deposit. The Nance Dulce deposit and surrounding area remain open to the discovery of additional mineralization and the Company intends to resume drilling at Nance Dulce in the future. The inferred resource for the Nance Dulce deposit tabulated below should therefore be considered an interim resource estimate. Details of the methodology used in tabulating the 2006 updated El Dorado resource estimate are available at www.sedar.com.

El Dorado Project Resources (as of July 25, 2006)

Deposit	Resource Category	Tonnes	Gold Grade (g Au/t)	Gold Ounces	Silver Grade (g Ag/t)	Silver Ounces	Gold Equivalent Grade (g AuEq/t)	Gold Equivalent Ounces
South Minita	Indicated	1,070,900	9.25	318,400	63.99	2,203,000	10.16	349,900
	Inferred	302,800	7.20	70,100	48.23	470,000	7.89	76,800
Minita	Measured	614,100	12.23	241,500	80.59	1,591,200	13.39	264,300
	Indicated	1,175,100	9.65	364,400	58.16	2,197,300	10.47	395,700
	Total M&I	1,789,200	10.53	605,900	65.86	3,788,500	11.47	660,000
	Inferred	78,400	10.39	26,200	67.44	170,000	11.39	28,700
Nance Dulce	Inferred	128,900	19.56	81,100	121.98	506,000	21.30	88,300
Coyotera	Measured	166,000	7.86	42,100	57.79	309,000	8.69	46,500
	Indicated	501,000	7.15	115,200	58.68	945,000	7.99	128,700
	Total M&I	667,000	7.34	157,300	58.48	1,254,000	8.17	175,200
	Inferred	19,000	5.83	3,600	72.12	44,000	6.86	4,200
Nueva Esperanza	Indicated	183,000	5.77	33,900	30.47	179,000	6.20	36,400
	Inferred	29,000	4.67	4,300	35.49	33,000	5.17	4,800
TOTAL MEASURED & INDICATED ALL DEPOSITS		3,710,100	9.35	1,115,500	62.24	7,424,500	10.24	1,221,500
TOTAL INFERRED ALL DEPOSITS		558,100	10.33	185,300	68.16	1,223,000	11.30	202,800
Notes: 1) Resources based on a gold equivalent cut-off grade of 4.0 g AuEq/t 2) Gold equivalents based upon a silver to gold ratio of 70:1 3) The Minita resource is INCLUSIVE of reserves defined in the January 2005 El Dorado Pre-feasibility Study

A technical report supporting the 2006 El Dorado Project resource estimate was filed on SEDAR on July 31, 2006.

The resources above were estimated by interpreting drill intercepts in cross section, coding samples, capping assays, compositing to vein thicknesses, and estimating grades and thicknesses of each of the veins into a three dimensional grade thickness model. Each of the three veins at the Minita deposit and ten veins at the South Minita deposit were estimated separately. Readers are referred to the Forward-Looking Statements and Other Cautionary Notes and National Instrument 43-101 sections for further disclosure.