"The legendary blade Excalibur stores the value of ores that are sacrificed to it and stacks it onto all new ores for a short time."


The Excalibur is an Exotic-tier furnace that was exclusive to May 2016 and was introduced in the Outdoors Update. Unlike every other furnace in Miner's Haven, this does not multiply ore value by a specific number. Instead, Excalibur has a unique effect where it stacks ore value from ore previously processed by the furnace. Its effect is quite complicated and it actually isn't useful without the unique ability to add one ore's value to another. However, this is considered to be one of the best furnaces in the game, as it can make ores of low value become profitable if used correctly. For example, if this furnace is placed with Remote Droppers/Spitfire Iron Mines nearby ores will rapidly increase your profit if a valuable ore is processed.

It was added in early May 2016. It was removed from boxes on June 16th, 2016. It was available again for Exotic Day on May 27th, 2017 and on April 15, 2018 for the 100 Million Plays Event. Reappeared sometime in July sold by the masked man for about 1.4k uC.

Prior to the 100 Million Visits Update, the timer that an ore's value was saved was 7 seconds. It has since been buffed to last for 14 seconds.


  • Using the Excalibur with mines that have a high drop rate (i.e. Wubium Mine) will lead to a rapid gain of cash if a high-value ore is processed.
    • A single Wubium Mine paired with an Excalibur can conclude with roughly a x350 process multiplier.