FTSE gains as UK mining index hits one-month high

(ADVISORY- Reuters plans to replace intra-day European and UK stock market reports with a Live Markets blog on Eikon - see cpurl://apps.cp./cms/?pageId=livemarkets for site in development. See the bottom of the report for more details)

* Blue (OTC BB: BUES - news) -chip FTSE 100 index gains 1 pct

* Miners track metals prices higher

* Housebuilders hit by Brexit concerns

* Indivior (LSE: INDV.L - news) falls on downgrade - trader

By Kit Rees

LONDON, June 6 (Reuters) - Britain's top share index climbed higher on Monday, with a rally in metals prices boosting the UK mining index to a one-month high, although housebuilders fell on concerns surrounding the June 23 referendum on the country's EU membership.

The commodity-heavy FTSE 100 index was up 1 percent at 6,271.42 points by 1202 GMT, outperforming the broader European market.

The UK mining index rose 5.4 percent to its highest level since early May as prices of major industrial metals advanced after a fall in the U.S (Other OTC: UBGXF - news) . currency, making dollar-priced commodities cheaper for holders of other currencies.

"Mining stocks are topping the FTSE 100 as the commodities space benefits from a weaker U.S. dollar basket. The currency's reversal of recent strength comes in response to Friday's surprisingly weak May U.S. jobs report," Mike van Dulken, head of research at Accendo Markets, said.

Miners Anglo American, Rio Tinto (LSE: RIO.L - news) , BHP Billiton, Antofagasta (Other OTC: ANFGF - news) and Glencore (Xetra: A1JAGV - news) all rallied between 4.4 percent to 8.9 percent.

Among the top fallers, however, British housebuilding stocks Berkeley Group, Persimmon (Other OTC: PSMMF - news) , Barratt Developments (LSE: BDEV.L - news) and Taylor Wimpey (LSE: TW.L - news) all fell between 0.9 percent and 1.5 percent after two opinion polls showed that Britain's "Out" campaign to leave the European Union was in the lead.

Brexit-related concerns also weighed on the domestically-focused FTSE 250, which was down 0.1 percent.

"We're in the final stages of the Brexit debate now, and anything with a strong UK exposure is starting to come under a bit of pressure from traders that are looking at stocks...that will see significant downside if there is a vote to leave the EU," Charles Hanover Investments' Roy said.

Pharmaceuticals company Indivior fell more than 10 percent with a trader citing a broker downgrade on the stock. Indivior had risen over 36 percent on Friday after winning a patent ruling on its main product, heroin substitute Suboxone Film.

ADVISORY- Reuters plans to replace intra-day European and UK stock market reports with a Live Markets blog on Eikon (see cpurl://apps.cp./cms/?pageId=livemarkets for site in development). In a real-time, multimedia format from 0600 London time through the 1630 closing bell, it will include the best of our market reporting, Stocks Buzz service, Eikon graphics, Reuters pictures, eye-catching research and market zeitgeist. Breaking news and dramatic market moves will continue to be alerted to all clients and we will continue to provide a short opening story and comprehensive closing reports.

If you have any thoughts, suggestions or feedback on this, please email mike.dolan@thomsonreuters.com.

Mike Dolan, Markets Editor EMEA. (Additional reporting by Atul Prakash; Editing by Jon Boyle)