* North Korean coal imports fell to 2-yr low
* Supplies from top supplier Australia and Mongolia fall
* Month-on-month drops stoke speculation decline could be due to import controls (Updates with details from top coal suppliers)
BEIJING, March 23 (Reuters) - China's imports of North Korea anthracite coal in February fell 18.7 percent from a year ago to the lowest since January 2015, after a ban on imports as a result of the reclusive nation's missile program.
Imports of anthracite coal, a hard coal with a high energy content used in steel mills, dropped to 1.23 million tonnes in February from 1.45 million tonnes in January, data from the General Administration of Customs released on Thursday.
Waning shipments from North Korea follows Beijing's decision in late February to ban coal imports entirely after Pyongyang tested an intermediate-range ballistic missile in a direct challenge to international efforts to stabilise the Korean peninsula.
The ban has also sent steel mills who use anthracite as a feed stock to find alternatives in the domestic market. Chinese anthracite prices gained more than 50 yuan ($7.26) per tonne to around 780 yuan ($113.26) in February, data provided by China Sublime Information Group showed.
Imports from China's top supplier Australia COA-AUCN-IMP in February plunged 29 percent from January to 5.16 million tonnes, the lowest since May. Still, Australian imports were 16.8 percent higher than a year ago, the data showed.
The decline adds to speculation that China is trying to control coal imports to aid the country's efforts to reduce overcapacity at domestic mines. head of China's quality supervision agency vowed to crack down on low-quality coal import. Traders in southern Chinese ports also reported cases of cargoes delayed due to customs checks.
Coal shipments from Mongolia COA-MNCN-IMP tumbled 37 percent from January to 1.97 million tonnes, though it more than doubled from the same period last year.
($1 = 6.8868 Chinese yuan renminbi)