* FTSE 100 down pct, mid caps down pct
* Precious metals rise as safe havens in demand
* Financials biggest weight
* Acacia drops on Tanzania troubles (Adds closing)
LONDON, Sept 4 (Reuters) - Britain's top share index slipped on Monday to snap a three-day winning streak as rising geopolitical tensions took their toll, hitting risky assets such as banks, but fears that it would trigger a broader sell-off proved to be unfounded.
Britain's blue chip FTSE 100 index closed down 0.3 percent at 7,414.74 points, while mid caps fell 0.5 percent.
"Equity markets in Europe are in the red today as tensions surrounding North Korea were heightened again on the back of the nuclear bomb test carried out by the regime over the weekend", said David Madden from CMC Markets.
"Traders are clearly nervous, as stocks are lower, but the sell-off today hasnt been as bad a previous ones."
Ken Odeluga, market analyst at City Index, added: "There is a thing called habituation. Markets are getting used to it, so whilst there is a bit of disquiet and there is a bit of noticeable reaction, I would suggest it is actually becoming more and more muted."
Banking stocks, which are more volatile than other sectors, tend to have their shares sold off more heavily when investors dump risky assets. Shares in HSBC, Barclays Standard Chartered and Lloyds dropped between 0.2 and 1.5 percent.
In the wider financial sector, Prudential fell 1.9 percent, Provident Financial and Standard Life Aberdeen both retreated 1.8 percent.
However, gold and silver miners had a positive session. These stocks are commonly used as proxies for investing in gold, which is considered a safe haven asset in times of political and financial uncertainty.
Shares in precious metals miner Fresnillo posted the best performance with a 2.9 percent rise while Randgold Resources rose 2 percent.
Shares in troubled mid cap Acacia Mining dropped 2.4 percent after it said that it would reduce its operations in Tanzania and cut jobs.
Shares in specialty chemicals firm Victrex rose 8.6 percent to a record high after cutting its effective tax rate and confirming the appointment of a new CEO.
(Reporting by Kit Rees and Julien Ponthus; Editing by Keith Weir and Pritha Sarkar)