(Reuters) - Global miners BHP Billiton (BHP.AX), V
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The falls in output come as competition heats up in global bulk commodities markets due to demand from China for imported industrial raw materials finally showing signs of waning after years of double-digit growth.
At $149.20 a metric tonne, iron ore .IO62-CNI=SI prices are 22 percent below last year's highs.
BHP (BLT.L), Vale and Rio Tinto (RIO.L) -- together controlling 70 percent of the world's seaborne iron ore market -- are counting on their super-sized operations to provide economies of scale and an edge over small competitors when demand softens. The more each miner can dig up the lower the costs and greater the ability to ride out a downturn.
Smaller miners operating in Australia, including Fortescue Metals Group (FMG.AX), Atlas iron (AGO.AX) and BC Iron (BCI.AX), are also expected to unveil weather-related disruptions to production runs in the last quarter.
"We have had an underweight position in the resources sector for several months now on our expectations for a slower rate of global growth in 2012 than in 2011 and our skepticism over the current level of commodity prices," said Ben Lyons, an analyst at ATI Asset Management, which manages A$500 million.
BHP said on Wednesday its iron ore output fell 8 percent, while data from Vale showed production down 15 percent. Rio Tinto reported a 10 percent fall on Tuesday.
Iron ore miners have been huge beneficiaries of China's rapid growth and urbanization in recent years. Last month BHP said it saw signs growth in iron ore demand in China was "flattening", triggering falls in global equity markets and commodity linked currencies such as the Australian dollar.
CHINA DEMAND
China's economy grew at its weakest pace in nearly three years in the first quarter, with the annual rate of expansion slowing more than expected to 8.1 percent from 8.9 percent in the previous three months.
Moderating growth could curb China's appetite for iron ore. Imports for the first quarter were up 6 percent at 187.6 million metric tonnes, versus a 14.4 percent increase in the same period last year, based on preliminary data from China's customs bureau.
In Australia, heavy rain and two early-season cyclones that drenched Rio Tinto and BHP iron ore pits early in the last quarter combined with high sea swells generated by Cyclone Lua in late March at the key export terminal ports of Dampier, Cape Lambert and Port Hedland to curb mining and delay ship loadings.
BHP's iron ore output totaled 37.9 million metric tonnes, down from 41.1 million metric tonnes in the December quarter. Rio's share of production from mines it owns outright and in joint ventures dropped to 45.6 million metric tonnes in the quarter versus 51.2 million tonestonnes in the previous quarter.
Vale's first-quarter iron ore production was 70 million metric tonnes versus 82.9 million tonnes in the fourth quarter.
Brazil's southeastern iron belt was also hit hard by heavy rain blamed for at least 34 deaths. As in Australia's western iron ore region, heavy rains are common in the region between January and March.
INDUSTRIAL ACTION
BHP also faced weaker production from its collieries in Australia's Bowen Basin supplying steel-making coal, which were constrained by a campaign of industrial action by roughly a third of the workforce, coupled with the impact of heavy rain on mining and shipping.
"The extent to which industrial action will continue to affect production, sales and unit costs is difficult to predict, however with inventories now severely depleted, the impact on future quarters may be significant," BHP said.
Unions have been staging rolling work stoppages at six mines since June 2011, demanding greater representation and improved working conditions.
BHP earlier this month declared force majeure on deliveries from the mines, which are owned in partnership with Japanese trading house Mitsubishi Corp <8058.
Force majeure is a legal clause relieving companies of immediate supply obligations due to circumstances beyond their control.
In total, mines operated under the partnership have an output capacity of more than 58 million metric tonnes a year, representing about a fifth of annual global trade in metallurgical, or coking coal.