* Investors look to Trump speech for clarity on economic policy
* Metals markets looking for big U.S. infrastructure spend
* Supply stoppages at major copper mines support copper prices (Adds comment, updates prices)
By James Regan
SYDNEY, Feb 28 (Reuters) - Copper slipped on Tuesday as investors took profits, with investors looking towards a speech by U.S. President Donald Trump for more clarity on his economic policy.
But persistent concerns over supply from large mines in Chile and Indonesia limited the decline.
Three-month copper on the London Metal Exchange was 0.04-percent lower at $5,908.50 a tonne at 0700 GMT, backtracking from an intraday high of $5,944.
The most-traded copper contract on the Shanghai Futures Exchange finished down 0.27 percent at 47,740 yuan ($6,952) a tonne.
Investors are waiting for a speech by Trump on Tuesday for signals on tax reform and infrastructure spending.
A strike at the Escondida copper mine in Chile, the world’s largest, appeared far from ending on Monday as the conflict neared its third week, with the union denying a news report that it had returned to talks with mine owner BHP Billiton .
Elsewhere, shareholders are pressuring miner Freeport-McMoRan Inc to stand up to the Indonesian government over changes the Southeast Asian country wants to make in the U.S. miner’s contract, with output halted at a giant copper mine.
“Copper was stronger for most of the day, which opened things up for profit-taking, which knocked prices back,” said a trader in Perth in Australia who did not want to be identified.
Aluminium eased 0.03 percent to $1,893 a tonne and zinc gained 0.17 percent to $2,811
London zinc prices have nearly doubled over the past 13 months and are closing in on nine-year highs, but signs of tightening in the global market for refined zinc means the rally may have further to run.
Tin was up 1 percent at $19,200 a tonne, while nickel slipped 0.9 percent to $11,025 a tonne.
In ShFE trading, nickel was up 0.52 percent, with zinc 0.13-percent lower.
Three month LME copper
Most active She copper
Three month LME aluminium
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Three month LME zinc
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Three month LME lead
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Three month LME nickel
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Three month LME tin
Most active She tin
$1 = 6.8674 Chinese yuan renminbi Reporting by James Regan; Editing by Joseph Radford