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June 7, 2010 – Vancouver, BC: Riverside Resources Inc. ("Riverside" or the "Company") (TSX-V: RRI) is pleased to announce that Guerrero Gold Inc. ("Guerrero Gold") and Riverside Resources Inc. have entered into an option agreement where by Guerrero Gold can earn up to 60% interest in Riverside's 100% owned Cerro Azul Gold-Copper Project, located in Guerrero, Mexico. In order for Guerrero Gold to earn 60% interest in the 260 km² property, Guerrero Gold must make share payments totaling 800,000 shares, make cash payments totaling $40,000, and incur exploration expenditures totaling $300,000 over 24 months. Previously announced exploration results (News Release March 4, 2009) from the project have identified multiple high-grade copper and gold target zones on the property, Guerrero Gold will continue to explore these zones in order to identify drill targets.

"The Cerro Azul Project is in a high potential prospective belt that has seen major discoveries made and built into mines. Riverside’s property has good road access and an extensive mineralized footprint, which makes this property a favorable candidate for a discovery", stated Dr. John-Mark Staude, President & CEO Riverside Resources, "After completing a first stage mapping and sampling program on the project the Riverside team identified multiple high grade copper-gold zones which will now be tested through our Joint Venture business model. The Riverside team looks forward to the advancement of this and other projects in Mexico towards drilling and discovery."

Property Details:

Riverside has completed an extensive mapping and sampling program which focused on exploring the large concession. The program defined more than seven target areas which include several epithermal gold targets and at least two porphyry copper-type hydrothermal centers. Field sampling and mapping has begun to outline various high grade copper targets, the most interesting being located on the southern half of the property. Field rock chip sampling from Cerro Azul has returned assays ranging in Cu values from 0.1 up to 3.95%. These assays indicate potential for high grade zones within at least four different 2 km² areas. Other targets identified on the property have high grade copper values in two meter channel samples taken from outcrops, these include:

  • Las Parotas with Cu of 1.38%, 1.9%, and 3.0%.
  • Loma Coyote with Cu values ranging up 2.0 % and 4.85% Cu.
  • Piedrillo-San Marcos, with samples up to 1.85% Cu.
  • El Llano (Fortuna) with several samples returning >0.5% Cu with 3 samples returning 4.25%, 4.55%, and 12.8% Cu.
  • San Jeronimo with samples of 1.03% and 1.70% Cu.

Outcropping and formerly mined mineralization on the Cerro Azul Concession contains chalcopyrite, bornite, pyrite, copper carbonates with sericite-pyrite-quartz-specularite and chlorite alteration, possibly indicative of the phyllic alteration zone of a Cu-Au-(Ag) porphyry system. In addition, the mineralized volcanic breccia may represent a lithocap and the surrounding polymetallic veins could be the peripheral manifestation of the porphyry system according to mapping by Riverside geologists. Mineralization occurs in a structural corridor with a prospective trend of at least 20 km length and up to 10 km wide, from Las Fraguas in the northern limit of the property to Cerro Azul in the southern part, where several Cu-Hg-Au mines produced during the 1900's.

A new independent NI 43-101 Technical Report is underway and will summarize these results to date and outline a recommended go forward exploration program.

Option Agreement Details:
For Guerrero Gold to earn a 60% interest it must complete the following:

Due Dates
Cash Payments
Share Payments
Exploration Expenditures
Upon date of the Definitive Agreement
$40,000
200,000
-
6 months
-
200,000
-
12 months
-
100,000
$200,000
18 months
-
150,000
-
24 months
-
150,000
$100,000
Total:
$40,000
800,000
$300,000

The first year payments exploration expenditures are a firm commitment on behalf of Guerrero Gold and must be remedied by a cash payment to Riverside if not satisfied.

Upon exercise of the option Riverside and Guerrero Gold will form a joint venture to hold their respective interests in the project

The scientific and technical data contained in this news release were prepared under the supervision of Locke Goldsmith, P. Eng., P. Geo., an independent qualified person to Riverside Resources, who is responsible for ensuring that the geologic information provided in this news release is accurate and acts as a "qualified person" under National Instrument 43-101 Standards of Disclosure for Mineral Projects.

Riverside also announces that it has granted 70,000 stock options to a senior officer of its Mexican subsidiary.

About Riverside Resources:

Riverside is a well funded prospect generation exploration team of focused, proactive gold discoverers with the breadth of knowledge to dig much deeper. The company currently has more than $2,000,000 in the treasury and fewer than 22,000,000 shares issued. The company has an experienced exploration team that leverages its in-house technical knowledge and vast experience in the field to make discoveries. Additional property information for the Company’s projects can be found on the Riverside Resources Inc. website at www.rivres.com.

About Guerrero Gold:

Guerrero Gold is a privately held mining exploration company with a vision to develop into a significant junior public resource company. Guerrero Gold is committed to the acquisition of domestic and international mining projects with a focus on optimizing profitability and enhancing shareholder value.