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HudBay Minerals Releases HudBay Minerals Releases HudBay Minerals Releases HudBay Minerals Releases Third Third Third Third Quarter 2010 Results Quarter 2010 Results Quarter 2010 Results Quarter 2010 Results Highlights Highlights Highlights Highlights

Production Results Financials

News release

TSX, NYSE – HBM

2010 No. 25

  • Generated EBITDA1 of $55.5 million, operating cash flow1 of $39.8 million and net earnings of $11.7 million
  • Cash costs per pound of zinc sold1, net of by-product credits, were negative US$0.27 per pound and co-product cash costs1 of gold, zinc and copper were $336 per ounce, $0.86 per pound and $1.37 per pound, respectively in the third quarter 2010
  • Established new US$300 million revolving credit facility
  • Production for all metals remains on track to meet 2010 guidance
  • Significant progress made on the Lalor project with access ramp more than one-third complete and tenders issued for all major long lead-time items

Toronto, Ontario November 3, 2 HudBay Minerals Inc. ("HudBay", the “company") Toronto, Ontario November , 2 HudBay Minerals Inc.

(TSX:HBM) (NYSE:HBM) today released its third quarter and year-to-date 2010 financial results. Net earnings were $11.7 million or $0.08 per share in the third quarter of 2010, compared to $20.0 million, or $0.13 per share during the third quarter of 2009. Earnings decreased during the quarter due primarily to lower volumes of metals sold, as well as higher tax and exploration expenses.

Sales of copper, gold and silver contained in copper concentrate were adversely affected by the inability of HudBay’s rail service provider to supply sufficient railcars to transport the company’s concentrate production. At September 30, 2010, HudBay had excess inventory of approximately 5,000 tonnes of copper and 7,800 ounces of gold contained in copper concentrate.

Had those inventories been sold in the third quarter at a copper price of US$3.60 per pound and a gold price of US$1,283 per ounce (being the average realized prices for copper and gold during the third quarter of 2010), the impact on revenues, earnings before tax and net earnings per share from the sale is estimated to be an additional approximately $50 million, $28 million and $0.11 per share, respectively.

1 EBITDA, operating cash flow before changes in non-cash working capital, cash costs per pound of zinc sold and coproduct cash costs are considered non-GAAP measures. See the reconciliation of these measures to GAAP at the end of this release.

HudBay has made arrangements to lease additional rail cars and expects to sell concentrate in amounts similar to production in the fourth quarter of 2010. The excess inventory is expected to be drawn down in the first half of 2011 as additional railcar capacity becomes available.

“Consistent operational results during the quarter enabled us to remain on track to meet our 2010 production guidance and continue to underpin HudBay’s strong overall performance,” said David Garofalo, HudBay’s president and chief executive officer. “Our new $300 million revolving credit facility is an important complement to our strong cash position of $852 million at September 30, 2010 as we pursue growth opportunities at various stages of the development pipeline.”

Cash costs per pound of zinc sold1, net of by-product credits, were negative US$0.27 per pound, compared to negative US$0.23 per pound in the third quarter of 2009. Cash costs net of by-product credits have been restated to exclude corporate costs. Cash costs on a co-product basis were $336 per ounce of gold, $1.37 per pound of copper and $0.86 per pound of zinc in the third quarter.

The revolving credit facility has an initial term of four years and is secured by a pledge of assets of HudBay and guarantees provided by the company’s material subsidiaries. The syndicate of lenders, comprising Canadian Imperial Bank of Commerce and Scotia Capital as Joint Lead Arrangers and Joint Book Runners, Royal Bank of Canada, The Toronto-Dominion Bank, Bank of America Merrill Lynch, Credit Suisse, National Bank of Canada and Société Générale, collectively approved commitments to the company well in excess of the $300 million requested. No advances are outstanding under the credit facility. As a result of arranging the new credit facility, restricted cash on deposit to support letters of credit, which totaled $59.3 million at September 30, 2010, will be reclassified to cash and cash equivalents.

HudBay continued to make significant progress on the planned 3,000 meter access ramp at the Lalor project, having advanced 1,154 meters from the Chisel North Mine as at October 26, 2010.

Ground conditions have been good and water intersections have been minimal since the first quarter of 2010. In September 2010, the company switched the ventilation system on the ramp from a “push” system to a “pull” system to assist in the blast clearing of the main ramp development face. This system will be in place until the ramp reaches the 810 meter level at the Lalor orebody in early 2012. The temporary ramp exhaust is currently being raisebored with 172 meters having been enlarged and 288 meters remaining. This raise will serve as the exhaust for the entire ramp drive until the permanent exhaust is in place in 2012. Surface site construction has begun and the access road is near completion. The surface mine site and surface exhaust sites have been cleared, and are currently being leveled.

Procurement and tendering is ongoing. The main production hoist and man hoist have been ordered with the man hoist expected to be delivered in the first quarter of 2011. Bid evaluation and contract award on the ventilation shaft and production shaft will be completed in Q4 2010. The mine camp accommodations have been awarded with site preparations to begin in November.

HudBay is continuing with the metallurgical testing of the Lalor ores, focusing on gold optimization, which includes variable testing on the primary grind, with and without a regrind circuit, as well as optimization on the reagent used and projected consumption.

The company has also begun a trade-off study on whether to refurbish the existing Snow Lake concentrator or construct a new concentrator at the mine site. The trade-off study is expected to be completed in the fourth quarter of 2010.

Total expenditures on the Lalor project were $36 million year-to-date as at September 30, 2010, with total spending of $54 million projected for 2010. HudBay’s previous estimate for 2010 capital expenditures at Lalor was $133 million, based on planned shaft sinkings in the third quarter of 2010. Planned timing of expenditures from 2010 to subsequent years of the project have been changed due to the deferral of the shaft sinking to early 2011. No changes have been made to expected total project costs or project timelines based on the current scope of the project.

($000s except per share amounts)Three Months Ended September 30Nine Months Ended September 30
2010200920102009
Revenue163,367194,608595,538554,049
Earnings before tax and non controlling interest29,57232,947116,499132,390
Net earnings11,66019,97548,492105,432
EBITDA1,255,46559,201208,495103,310
Operating cash flow1,339,82548,214139,92391,051
Basic and diluted EPS40.080.130.320.68
Operating cash flow per share1,30.270.310.930.59
Cash and cash equivalents851,739880,292851,739880,292
Total assets2,065,5962,000,7762,065,5962,000,776

1 EBITDA, operating cash flow and operating cash flow per share are considered non-GAAP measures. See the reconciliation of these measures to GAAP at the end of this release.

2 EBITDA represents earnings before interest expense, taxes, depreciation and amortization, gain/loss on derivative instruments, exploration and interest and other income.

3 Before changes in non-cash working capital.

4 Earnings per share.

Overall, production remains on track to meet our 2010 guidance. Mine production was 578,372 tonnes of ore, reflecting a 5% increase from 551,329 tonnes for the same quarter in 2009 as additional production from the reopened Chisel North mine in 2010 was offset by lower production from the 777 and Trout Lake mines relative to the strong production levels achieved in 2009.

Three Months Ended Nine Months Ended Operating Highlights Sep 30 Sep 30 Sep 30 Sep 30 Sep 30 Sep 30 2010 2009 2010 2010 2009 Production (HBMS contained metal in concentrate)1 Zinc tonnes 18,091 18,091 20,728 58,194 58,194 57,484 Copper tonnes 14,913 14,913 14,913 13,286 38,753 38,753 38,753 37,182 14,913 38,753 Gold troy oz. 23,789 23,789 25,886 64,801 64,801 69,852 Silver troy oz. 205,522 205,522 298,777 633,613 633,613 756,429 Metal Sold Zinc - refined2 tonnes 25,698 25,698 29,349 77,741 77,741 80,771 25,698 25,698 77,741 77,741 Copper tonnes Cathode & anodes 2,797 2,797 15,293 31,745 31,745 51,117 Payable metal in concentrate3 6,321 6,321 - 6,864 Gold troy oz.

Contained in slimes & anode 6,296 6,296 21,900 53,920 53,920 74,921 Payable metal in concentrate3 10,789 10,789 - 11,781 Silver troy oz.

Contained in slimes & anode 53,695 53,695 506,148 768,223 768,223 1,711,212 Payable metal in concentrate3 85,044 85,044 1 Metal reported in concentrate is prior to refining losses or deductions associated with smelter terms.

2 Zinc sales include sales to our Zochem facility of 8,080 tonnes in the third quarter of 2010. In the third quarter, Zochem had sales of 10,668 tonnes of zinc oxide.

3 Copper concentrate was not sold in 2009 while the smelter was in operation.

Total revenue for the third quarter was $163.4 million, $31.2 million lower than the same quarter last year, due to the following:

Three Months Nine Months Ended Ended Sep 2010 Sep 30,2010 (in $ millions) Sep

Higher zinc prices 8.6 8.6 8.6 57.4 8.6 Higher copper prices 23.2 23.2 124.3 Higher gold prices 7.5 7.5 19.9

Lower copper sales volumes (48.1)

(48.1) (93.0) Lower zinc sales volumes (8.0)

(8.0) (5.2) (6.4) (11.3) Lower gold sales volumes (6.4)

Stronger C$ (9.7)

(9.7) (58.9) Other volume and pricing differences 1.7 1.7 8.3 Change in revenues (31.2)

(31.2) 41.5

Realized Metal Prices1 and Exchange Rate Realized Metal Prices and Exchange Rate

LME LME Q3 YTD Q3 2010 2010 Average Average Prices 2 Prices 2HudBay Realized Prices 1 Three Months EndedHudBay Realized Prices 1 Nine Months Ended
Sep 30 Sep 30 2010 2009Sep 30 Sep 30 2010 2009
Prices in US$
Zinc US$/lb.0.910.960.960.831.010.70
Copper US$/lb.3.293.253.602.743.322.21
Gold US$/troy oz.1,2271,1771,2839551,186917
Silver US$/troy oz.18.9618.0721.0614.5117.8513.43
Prices in C$
Zinc C$/lb.0.950.991.000.911.050.81
Copper C$/lb.3.413.373.753.013.452.57
Gold C$/troy oz.1,2751,2191,3361,0461,2301,083
Silver C$/troy oz.19.7018.7221.9315.9318.5215.80
Exchange rate US$1 to C$1.041.101.041.17

1 Realized prices are before refining and treatment charges and only on the sale of finished metal, excluding metal in concentrates.

2 London Metals Exchange (“LME”) average for zinc, copper and gold prices, London Spot US equivalent for silver prices. HudBay’s copper sales contracts are primarily based on Comex copper prices.

For the third quarter of 2010, our operating expenses were $92.7 million; $26.5 million lower than the same quarter last year due to the following:

Three Months Nine Months Ended Ended (in $ millions) Sep 30 2010 Sep 30

Decreased volumes of purchased zinc concentrate (3.0)

(3.0)

Decreased volumes of purchased copper concentrate (12.7)

(12.7) (58.5) Chisel North operating costs 6.8 6.8 10.2 Zochem zinc purchases 4.1 4.1 14.5 Lower costs for HMI Nickel 1.6 1.6 2.2 Other provisions, primarily related to Smelter closure 0.2 0.2 (3.0) Smelter and refinery costs (13.2)

(13.2) (16.5) Changes in domestic inventory (14.0)

(14.0) 4.5 Other operating expenses 3.7 3.7 7. 7.7

Decrease in operating expenses (26.5)

(26.5) (44. (44.0)

Purchased copper concentrate volumes and smelter and refinery direct costs decreased due to the closure of the smelter. Lower zinc concentrate purchases were more than offset by Chisel North operating costs and production. Inventory charges were lower in the third quarter of 2010 due to the buildup of copper concentrate inventory.

Detailed operating expenses, EBITDA, operating cash flow before changes in non-cash working capital, operating cash flow per share, cash cost per pound of zinc sold and co-product cash costs per unit sold are included in this news release because these measures are performance indicators that we use internally to monitor performance. We use these measures to assess how well we are performing compared to plan and to assess the overall effectiveness and efficiency of mining, processing and refining operations. We believe that the inclusion of these measures in this news release helps an investor to assess performance “through the eyes of management” and that certain investors use these measures to assess our performance. These measures do not have a meaning presented by Generally Accepted Accounting Principles (“GAAP”) and should not be considered in isolation or as a substitute for measures prepared in accordance with GAAP. These measures are not necessarily indicative of operating profit or cash flow from operations as determined under GAAP. Other companies may calculate these measures differently.

The following table presents our calculation of EBITDA for the three and nine months ended September 30, 2010 and September 30, 2009.

Three Months Ended Nine Months Ended Sep 30 Sep 30 Sep 30 Sep 30 Sep 30 ($000s) 2010 2010 2009 2010 2010 2009

Earnings before tax and non-controlling interest 29,572 29,572 32,947 116,499 116,499 132,390 Adjustments:

Depreciation and amortization 25,267 25,267 25,267 28,822 82,618 82,618 82,618 73,078 25,267 82,618 Exploration 5,868 5,868 983 18,868 18,868 3,615 Interest and other income (3,133) (3,329) (6,117)

(6,117) (106,235) (3,133) (6,117)

(6,117)

(Gain) loss on derivative instruments (2,109)

(2,109) (222) (3,373)

(3,373) 462 55,465 59,201 208,495 EBITDA 55,465 208,495 103,310

Operating cash flow before changes in non g cash flow before changes in non

The following table presents our calculations of operating cash flow before changes in non-cash working capital and operating cash flow per share for the three and nine months ended September 30, 2010 and September 30, 2009.

Three Months Ended Nine Months Ended

Sep 30 Sep 30 Sep 30 ($000s except share and per share Sep 30 2010 2009 2010 2010 2009 amounts) 2010

Cash provided by operating activities, per financial statements 31,933 31,933 56,595 190,726 190,726 66,562 Adjustments:

Changes in non-cash working capital 7,892 7,892 (8,381) (50,803)

(50,803) 24,489 Operating cash flow before changes in non-cash working capital 39,825 39,825 48,214 139,92 139,923 139,92 91,051 139,92 Weighted average shares 148,949,050 148,949,050 153,443,348 148,949,050 151,114,563 153,432,764 148,949,050 151,114,563 outstanding Operating cash flow per share $0.27 $0.27 $0.31 $0.93 $0.93 $0.59 Our cash cost per pound of zinc sold, net of by-product credits, for the third quarter of 2010 was negative US$0.27 per pound, excluding costs and sales related to Balmat, HMI Nickel and corporate activities, as calculated in the following table.

Three Months Ended Nine Months Ended Sep 30 Sep 30 Sep 30 Sep 30 Sep 30 ($000s except as noted) 2010 2010 2009 2010 010 2009 2010 010

Operating expenses 92,652 92,652 119,169 355,805 355,805 399,794 General and administrative 1,796 1,796 2,250 6,120 6,120 6,120 4,587 expenses1 1,796 6,120 1,796 94,448 94,448 121,419 361,925 361,925 361,925 404,381 361,925 Exclude amounts related to Balmat and HMI Nickel (3,720)

(3,720) (1,959) (13,820)

(13,820) (9,920) (3,720)

(3,720) (13,820)

(13,820)

90,728 119,460 348,105 348,105 394,461 Less by-product credits2 (106,390)

(106,390) (135,583) (415,632)

(415,632) (409,540) Cash cost net of by-products (15,662)

(15,662) (16,123) (67,527)

(67,527) (15,079) Exchange rate (US $1 to C$) 3 1.039 1.039 1.097 1.036 1.036 1.170 Cash cost net of by-products US (15,074) US (14,697)

(15,074) US (65,181) US(12,888) (65,181)

Zinc sales (000's lbs.) 56,654 56,654 64,703 171,389 171,389 176,302 Cash cost per pound of zinc sold, net of by-product credits in US $/lb. US .27)

.27) US (0.23) US (0.38)

(0.38) US (0.07) 1 General and administrative expenses relate to HBMS entity only.

2 By-product credits include revenues from sale of copper, gold, silver, the value added by converting zinc to zinc oxide, and by-product sales.

3 Weighted average exchange rate for sales during the period.

Cash costs net of by-product credits have been restated to exclude corporate activities in order to be better comparable with costs disclosed by comparable mining companies. For the third quarter of 2010, our cash cost per pound of zinc sold was negative US$0.27, a net decrease of US$0.04 from the same period in 2009, and for the year-to-date was negative US$0.38, a net decrease of US$0.31 from 2009. The decrease in cost per pound was due primarily to higher by-product copper, gold and silver credits arising from higher prices.

Our calculation of cash cost per pound of zinc sold is significantly influenced by by-product metal prices, which may fluctuate going forward.

product cash costs per unit sold product cash costs per

Commencing in the third quarter of 2010, we introduced co-product cash costs as a new non GAAP measure. We believe that these costs serve as meaningful indicators for investors to evaluate our operations. Costs for 2009 have not been included for comparability because they included substantial purchased copper concentrate volumes together with the cost of the smelter and refinery, which were shutdown in 2010.

Whereas cash costs net of by-product credits present the cash costs of a single metal, assuming that all other metals are by-products of the given metal, co-product cash costs present a cost of producing each of our primary metals, copper, zinc and gold, based on an allocation of costs among the metals. Costs that can be readily associated with a specific metal are allocated to that metal. Mining and milling costs for our Trout Lake and 777 mines are allocated proportionately based on the value of the contained metals at prevailing metals prices. Operating overhead expenses and general and administrative expenses (in both cases, excluding costs not related to our HBMS operations) are generally allocated equally between zinc and copper with some further cost allocation to gold. In order to present a cost per finished unit sold, we also add to these costs third party treatment and refining costs, which are deducted from revenue in our financial statements.

Zinc oxide production is treated as a by-product of zinc production, so the costs of our Zochem operation are allocated to zinc operating expenses and zinc oxide revenues are deducted from total zinc cash costs. Similarly, silver production is treated as a by-product of gold production. Other miscellaneous revenues are allocated among zinc, copper and gold in the same manner as general and administrative costs.

While the impact of fluctuating metals prices is expected to be less significant on co-product cash costs than it is on by-product cash costs, changes in relative metals prices may cause our reported cash costs to vary substantially over time, irrespective of our operational results. Significant management judgement is also required in determining how costs should be allocated among metals. Caution should also be exercised in using co-product cash costs to evaluate the profitability of a particular metal, as the profitability of our polymetallic mines is dependent on the production of all of our principal metals. Our future co-product cash costs may change significantly from those reported for the three and nine months ended September 30, 2010 as we complete the transition from copper smelting and refining to copper concentrate sales.

Copper Zinc Gold Non-allocated Total ('000s except as noted) costs Operating expenses 23,779 57,328 7,825 3,720 92,652 General and 718 718 359 5,575 7,370 administrative1 Treatment and refining 3,681 - 920 - 4,601 costs2 28,178 58,046 9,104 9,295 Zinc oxide and by-product (641) (9,302) (3,362)

revenues costs 27,537 48,744 48,744 5,742 costs 27,537 Sales volume3 20,104 56,655 17,085

product cash costs per product cash costs per $1.37 $1.37 $0.86 $0.86 $336 unit3 sold unit sold

1 Allocation of general and administrative costs to copper, zinc and gold production exclude corporate and other non-production related costs.

2 Treatment and refining costs are deducted from revenue.

3 Copper and zinc sales volumes denoted in 000's pounds, and gold sales volumes denoted in troy oz.

Copper Zinc Gold Non-allocated Total ('000s except as noted) costs

Operating expenses119,682 181,29741,00613,820 355,805
General and administrative12,4482,4481,22412,99419,114
Treatment andrefining 6,305-920-7,225

costs2 128,435 183,745 43,150 26,814 Zinc oxide and by-product (2,647) (28,627) (17,334)

revenues product costs 125,788 125,788 155,118 155,118 155,118 25,816 product costs 125,788 125,788 155,118 25,816 Sales volume3 85,119 171,391 65,702

product cash costs per product cash costs per $1.48 $1.48 $0.91 $0.91 $393 unit3 sold unit sold 1Allocation of general and administrative costs to copper, zinc and gold production exclude corporate and other non-production related costs.

2Treatment and refining costs are deducted from revenue.

3Copper and zinc sales volumes denoted in 000's pounds, and gold sales volumes denoted in troy oz.

Please also see HudBay’s consolidated financial statements and related notes together with Management's Discussion and Analysis of Operations and Financial Condition for the quarter ended September 30, 2010, which are available under our profile on SEDAR at www.sedar.com and on our website at www.hudbayminerals.com. All amounts are in Canadian dollars unless otherwise noted.

HudBay Minerals Inc.:

www.hudbayminerals.com

Management’s Discussion and Analysis:

http://media3.marketwire.com/docs/hbmmdaQ310.pdf

Financial Statements:

http://media3.marketwire.com/docs/hbmfsQ310.pdf

Date: Thursday, November 4, 2010 Time: 10:00 a.m. ET Webcast: www.hudbayminerals.com Dial in: 416-644-3416 or 877-974-0446 Replay: 416-640-1917 or 877-289-8525 Replay Passcode: 4371198#

The conference call replay will be available until midnight (Eastern Time) on November 11, 2010. An archived audio webcast of the call also will be available on HudBay's website.

HudBay Minerals Inc. (TSX, NYSE: HBM) is a Canadian integrated mining company with assets in North and Central America principally focused on the discovery, production and marketing of metals. The company’s objective is to maximize shareholder value through efficient operations, organic growth and accretive acquisitions, while maintaining its financial strength. A member of the S&P/TSX Composite Index and the S&P/TSX Global Mining Index, HudBay is committed to high standards of corporate governance and sustainability.

This news release contains "forward-looking information" within the meaning of applicable securities laws. Forward-looking information includes but is not limited to information concerning the company’s ability to meet its production guidance and realize growth opportunities and the company’s strategies and future prospects. Generally, forward-looking information can be identified by the use of forward-looking terminology such as "plans", "expects", or "does not expect", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", “understands” or "does not anticipate", or "believes" or variations of such words and phrases or statements that certain actions, events or results “will”, "may", "could", "would", "might", or "will be taken", "occur", or "be achieved". Forward-looking information is based on the views, opinions, intentions and estimates of management at the date the information is made, and is based on a number of assumptions and subject to a variety of risks and uncertainties and other factors that could cause actual events or results to differ materially from those anticipated or projected in the forward-looking information (including the actions of other parties who have agreed to do certain things and the approval of certain regulatory bodies).

Many of these assumptions are based on factors and events that are not within the control of HudBay and there is no assurance they will prove to be correct. Factors that could cause actual results or events to vary materially from results or events anticipated by such forward-looking information include the ability to develop and operate the Lalor project on an economic basis, risks associated with the mining industry such as economic factors (including costs of construction materials, future commodity prices, currency fluctuations and energy prices), failure of plant, equipment, processes and transportation services to operate as anticipated, including new and upgraded facilities at Lalor, dependence on key personnel, employee relations and availability of equipment and skilled personnel, environmental risks, government regulation, actual results of current exploration activities, possible variations in ore grade, dilution or recovery rates, permitting timelines, capital expenditures, reclamation activities, land titles, and social and political developments and other risks of the mining industry, as well as those risk factors discussed in the company’s Annual Information Form dated March 31, 2010, which risks may cause actual results to differ materially from any forward-looking statement.

Although HudBay has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking information, there may be other factors that cause actions, events or results not to be anticipated, estimated or intended.

There can be no assurance that forward-looking information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such information. HudBay undertakes no obligation to update forward-looking information if circumstances or management's estimates or opinions should change except as required by applicable securities laws, or to comment on analyses, expectations or statements made by third parties in respect of HudBay, its financial or operating results or its securities. The reader is cautioned not to place undue reliance on forward-looking information.