FTSE inches up for first September trades after 2nd monthly strike

* FTSE 100 ends up 0.1 percent

* Miners rise, banks mixed

* Indivior (Frankfurt: 2IVA.F - news) 's collapse drags midcaps down (Adds closing prices)

By Julien Ponthus

LONDON, Sept 1 (Reuters) - UK blue chips, backed by buoyant mining stocks, were up for their first September trades on Friday after outperforming their European peers with a second consecutive monthly rise in August.

The FTSE 100 ended up 0.1 percent, while the mid cap FTSE 250 index was held back with a 0.1 percent retreat due to the collapse of Indivior's shares.

The drugmaker's shares sank 35 after it said it would appeal against a U.S. court ruling which potentially opens the way to a rival to the firm's Suboxone Film opiod addiction treatment.

"The company is facing a mammoth struggle now," said Neil Wilson (Oslo: WILS.OL - news) , a senior market analyst at ETX capital.

Other midcaps suffered blows including Greene King (Frankfurt: A0F66P - news) , down 3.8 percent after HSBC cut its rating on the stock and electronics retailer Dixons Carphone (Frankfurt: CWB.F - news) , which lost 1.7 percent after both Investec (LSE: INVP.L - news) and Morgan Stanley (Xetra: 885836 - news) took a more negative view on its prospects.

Miners, which had already helped the FTSE stay in positive territory in the previous session, were up with Glencore (Amsterdam: GX8.AS - news) rising 2.1 percent, Antofagasta (Other OTC: ANFGF - news) 2.2 percent and Rio Tinto (Hanover: CRA1.HA - news) 0.3 percent.

Energy sector heavyweights BP and Royal Dutch Shell (LSE: 0LN9.L - news) fell 0.1 and 0.2 percent respectively.

Financials were mixed with HSBC and Lloyds falling slightly and Barclays (LSE: BARC.L - news) and Standard Chartered (BSE: 580001.BO - news) both up around 0.5 percent.

Provident Financial (Other OTC: FPLPF - news) , which made the headlines in August with a profit warning and the departure of its CEO Peter Crook, saw its shares fall 1.2 percent after Jeffries cut its recommendation from 'buy' to 'hold'. (Reporting by Julien Ponthus; Editing by Richard Balmforth)