Toronto, ON -- Avalon Rare Metals Inc. (TSX:AVL, OTCQX:AVARF) ("Avalon" or the "Company") is pleased to provide an update on the Inferred and Indicated Mineral Resources reflecting the results from the 2010 winter drilling program on its Nechalacho rare earth elements ("REE") deposit, Thor Lake, Northwest Territories, Canada.

As previously announced in the Company's news release dated July 19, 2010, results from the Company's 2010 winter definition drilling program in the area referred to as West Long Lake encountered considerable new, higher grade REE mineralization in the Basal Zone. This new data was integrated into the block model for the deposit and its effect on the resources has now been estimated by Avalon's Senior Resource Geologist, Finley Bakker, P.Geo.

The winter drilling has increased the Indicated Mineral Resources in the key Basal Zone part of the deposit by 40% with an additional 5.97 million tonnes grading 1.57% TREO with 25.5% HREO/TREO[1], using the same $260 NMR (Net Metal Return) cut-off grade applied in the previous resource estimate reported on June 14, 2010. Combined with the previously announced NI 43-101 compliant Indicated Resources located in the area referred to as Tardiff Lakes, the total Indicated Mineral Resources in the Basal Zone now stands at 20.45 million tonnes grading 1.75% TREO with 23% HREO/TREO.

Further, the Basal Zone in the West Long Lake area contains a high grade sub-zone defined by applying a higher cut-off grade at $600. This yields 1.87 million tonnes grading 2.19% TREO, with 28.8% HREO/TREO, 4.29% Zirconium Oxide, 0.50% Niobium Oxide and 0.06% Tantalum Oxide, representing 30% of the total Indicated Resources in the West Long Lake area. Further additions to this high grade sub-zone are anticipated from the 2010 summer drilling program on the land-accessible north extension of this zone.

The increase in Indicated Mineral Resources in the Basal Zone will have a positive effect on the economics of the project, through extension of the mine life used in the financial model. In addition, the definition of higher grade sub-zones that can be selectively mined immediately after start-up will further benefit the project economics through increased revenues during the early years of production. In addition, the new high grade Indicated resources in the West Long Lake area are conveniently located adjacent to the planned access ramp requiring little adjustment in the mine plan to develop them.

The 2010 winter definition drilling program was designed to reduce the average spacing of intercepts in the Basal Zone to 50m and bring the higher grade parts of the deposit into Indicated resource category. This drilling was concentrated in those areas only accessible during the winter months. This included the West Long lake area where 13 holes totalling 3808 metres were drilled from the ice to follow up on two very encouraging intercepts drilled in 2009 which assayed up to 1.90% TREO with 27% HREO/TREO over 43.0m.

The balance of the definition drilling was carried out in the Tardiff Lakes area. A second rig conducted condemnation drilling over areas of planned infrastructure and completed several wide-spaced, step-out exploration holes to the south and north of the known resource. 

The Mineral Resource Summary for the West Long Lake area is provided in Table 1 below. The procedure followed by Mr. Bakker was similar to that of Hudgtec and Scott Wilson RPA for the NI 43-101 compliant resource as disclosed in the Company's News Release dated June 14, 2010. The base case cut-off grade, composite methodology, estimation method (Inverse Distance Squared), block size, domains and estimation parameters were all identical. A plan of the new Indicated and Inferred Resources will be posted on the Avalon website (Nechalacho Drill Hole Location Map).

Table 2 below provides the updated total resources for the Nechalacho deposit for both the Upper and Basal Zones and in both the Indicated and Inferred categories. Total Inferred Mineral Resources for the Upper and Basal Zones combined stands little changed at 182.56 million tonnes grading 1.40% TREO with 15% HREO/TREO.  It is also worth noting that the Inferred Resources do not account for step-out holes L10-241 on Cressy Lake (550 metres north of the resources) and L10-249 on Thor Lake (300 metres west of the resources), both of which encountered Basal Zone mineralization meeting the base case cut-off grade (News Release of July 19, 2010).

The resources were estimated using a cut-off value which takes into account firstly the aggregate value of the various commodities adjusted (in the case of rare earths) for payable proportion due to them being marketed as unseparated mixtures, and also the metallurgical recoveries in both flotation and hydrometallurgical processing. This value, expressed in Canadian dollars, is referred to as the Net Metal Return or NMR and is roughly equivalent to the Net Smelter Return (NSR) per tonne of rock for base metals. In calculating the NMR, the same price assumptions were used as in the previous resource estimate. Metals used in the calculations included Nb, Ta, Zr and all of the rare earth elements, with the exception of Tm and Yb, which were assigned zero value.

SUMMER PROGRAM PROGRESS

The summer drill program continues with excellent production from two drill rigs, one producing HQ and the second producing very large size PQ core. The PQ drilling will provide additional bulk sample material for the upcoming metallurgical pilot plant work. Since drilling resumed in late June, 34 holes totalling 8757 metres have been completed. Drilling for new Basal Zone intercepts to produce both measured and indicated resources is being combined with oriented-core geotechnical logging for rock quality, under the supervision of Knight Pi�sold Consulting. Initial assays from the summer drilling are expected by late October, 2010.

The new airstrip has proven very useful for more efficient transportation due to higher cargo capacity and lower cost for aircraft on wheels. In addition, the airstrip will enable safer transport of employees and cargo during the Fall and Spring seasons.

Stantec Engineering and EBA Consultants are continuing the summer program of environmental and engineering work at site. This comprises on-going baseline environmental data collection as well as studies of proposed tailings sites. The environmental work includes wildlife studies completed in June and fish and water studies underway at present.

Traditional Knowledge studies in cooperation with First Nations and Metis communities have also commenced under the supervision of an independent consultant through EBA Consultants. This is expected to continue with all communities located in proximity to the project.

The Environmental Assessment process has commenced with the Mackenzie Valley Environmental Impact Review Board (MVEIRB) chairing scoping sessions in the communities, including Dettah (Yellowknife), Fort Resolution, Lutsel k'e and Hay River Reserve and for a scoping technical session in Yellowknife before federal and territorial government departments.  The Scoping sessions conducted by MVEIRB are designed to identify any community concerns about the environmental impacts of the Nechalacho Project. The Scoping sessions will be completed by the end of September at which time MVEIRB will compile the list of questions and concerns in a report called the Terms of Reference which will become the basis for Avalon's developer's assessment report (environmental impact statement).

Regular aboriginal engagement activities continue with members and/or elders from the local communities including site visits. Positive discussions are also advancing with these communities regarding potential partnership and participation opportunities in the development of the Nechalacho deposit.  Avalon remains committed to the community engagement process which is on-going through development and throughout future operations.

Drilling operations are being performed by Foraco Drilling Ltd. of Yellowknife, NWT under the supervision of J.C. Pedersen, P.Geo. Bruce Hudgins, P.Geo., maintained the geological database and monitors QA/QC on the laboratory analyses. The Company's Vice-President, Exploration, William Mercer, Ph.D., P.Geo. (Ont), P. Geol (NWT) is providing overall direction on the project. The qualified persons for the purposes of this news release are Finley Bakker, William Mercer and D.S. Bubar, P. Geo., President.

About Avalon Rare Metals Inc. (TSX:AVL, OTCQX:AVARF)

Avalon Rare Metals Inc. is a mineral exploration and development company focused on rare metals deposits in Canada. Its flagship project, the 100%-owned Nechalacho Deposit, Thor Lake, NWT, is emerging as one of the largest undeveloped rare earth elements resources in the world. Its exceptional enrichment in the more valuable 'heavy' rare earth elements, which are key to enabling advances in green energy technology and other growing high-tech applications, is one of the few potential sources of these critical elements outside of China, currently the source of 95% of world supply. Avalon is well funded, has no debt and its work programs are progressing steadily. Social responsibility and environmental stewardship are corporate cornerstones. Avalon's performance on community engagement in the north earned it the 2010 PDAC Environmental and Social Responsibility Award.

Shares Outstanding:   79,104,270. Cash resources: approximately $7 million.

To find out more about Avalon Rare Metals Inc., please visit our website at www.avalonraremetals..com.  For questions and feedback, please e-mail the Company at ir@avalonraremetals.com or phone William Mercer, Ph.D., P.Geo., VP Exploration, at 416-364-4938. 

This news release contains forward-looking information and is subject to a variety of risks and uncertainties and other factors that could cause actual events or results to differ materially from those projected in the forward-looking information. Forward-looking information is based on the opinions and estimates of management at the date the information is given, and is subject to a variety of risks and uncertainties and other factors that could cause actual events or results to differ materially from those projected in the forward-looking information. The forward-looking information contained herein is given as of the date hereof and the Company assumes no responsibility to update or revise such information to reflect new events or circumstances, except as required by law.