Britain's FTSE hits 3-week low; commodities weigh

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* FTSE 100 closes 0.9 percent lower

* Mining and energy stocks among top fallers

* Antofagasta (Other OTC: ANFGF - news) sees output at lower end of range

By Atul Prakash and Alistair Smout

LONDON, Oct (Shenzhen: 000069.SZ - news) 26 (Reuters) - Britain's top share index hit a three-week low on Wednesday, with hotel operator Whitbread falling on a raft of negative broker comments and Antofagasta dragging down miners after a disappointing earnings update.

The blue-chip FTSE 100 index closed 0.9 percent lower after falling to its lowest level since Oct. 3 earlier in the day. But it is still up about 11 percent so far this year.

Whitbread (LSE: WTB.L - news) fell 4.6 percent, the top faller in the FTSE 100 index, after Deutsche Bank (LSE: 0H7D.L - news) , Kepler Cheuvreux, Credit Suisse (LSE: 0QP5.L - news) and Canaccord Genuity (Other OTC: CCORF - news) all cut their price targets for the stock, one day after it reported a slowdown in sales growth.

"We believe Whitbread's new CEO is taking the right actions - chasing down efficiencies, investing where needed, focusing on scale opportunities internationally - but the market backdrop is tough," UBS (LSE: 0QNR.L - news) analysts said, adding that they had cut their 2018 earnings per share estimate for the company by 5 percent.

Basic resources stocks were on the back foot, with the UK mining index down 1.4 percent, pressured by a 3.2 percent fall in Antofagasta after the company said it saw output for this year coming in at the lower end of its previous guidance. It also forecast lower output for 2017.

"Equity indices are lower across the board, with the decline in commodities taking its toll. Even (Taiwan OTC: 6436.TWO - news) without the decline in commodity prices, these indices continue to look toppy at the moment," OANDA analyst Craig Erlam said.

"While we may be well supported for now, this is not a set up that is indicative of a market that's about to tear higher. Especially not against the fundamental backdrop of mediocre earnings and a Fed rate hike."

Shares (Berlin: DI6.BE - news) in Anglo American (LSE: AAL.L - news) , Glencore (Xetra: A1JAGV - news) and BHP Billiton fell between 1.7 and 2.2 percent.

Energy stocks tracked weaker oil prices, with Royal Dutch Shell (LSE: RDSB.L - news) , BP and Tullow Oil (LSE: TLW.L - news) dropping around 1.5 percent. The UK oil and gas index declined 1.8 percent.

Among some standout gainers, IAG was up 5.2 percent, the top FTSE 100 riser, after British Airways agreed to pay 300 million pounds ($367 million) per year into its pension scheme, plus top-ups, under a new plan which leaves room for the airline to pay dividends to owner IAG.

Burberry rose 1 percent after well-received earnings from sector peer Kering (LSE: 0IIH.L - news) .

Tesco (Xetra: 852647 - news) and Sainsbury (Amsterdam: SJ6.AS - news) gained 1.6 percent and 1.3 percent respectively after Goldman Sachs (NYSE: GS-PB - news) raised its target prices on both the stocks. However, it said that British supermarkets did not offer reward for risk in the context of steep inflation. (Editing by Robin Pomeroy)