Concentrated coal deposit

Concentrated coal deposit
Release	17 September 2009 (Update)
Members	Yes
Level	70
Quest	No
Location	Living Rock Caverns
Properties
Core	No
Durability	500
Hardness	140
Multiplier	0.8
Output
Ore	Coal (116 coins)
Average xp	160
Examine
A large concentration of coal.
talk • view

Concentrated coal deposit17 September 2009 (Update)YesNo701405000.8NoLiving Rock CavernsCoal (116 coins)160A large concentration of coal.

Concentrated coal deposits are clumps of coal located in the Living Rock Caverns beneath the Dwarven Mines. They require level 70 Mining to mine, have a durability of 500, a hardness of 140, and an experience multiplier of 0.8. There are 8 of these deposits in the caverns. Concentrated coal deposits contain a much larger supply of coal than a normal coal rock, granting five ores at once. This bonus stacks additively with the bonuses from Varrock armour, the Mining cape's perk, and the reward from the Shooting Star Distraction and Diversion, potentially resulting in a total of 8 ores at once. Additionally, they consume 5 coal stone spirits to produce 5 coal each time they are mined. Unlike coal rocks, these grant igneous geodes rather than sedimentary geodes.

The deposits are guarded by the creatures of the Living Rock Caverns, the living rock protectors, living rock strikers, and living rock patriarch. These monsters are aggressive and pose a threat to any players mining from the concentrated deposits, so it is generally advised to mine on world 83, the official world for the Living Rock Caverns. Multitudes of players mine and fish in the Living Rock Caverns on this world, lessening an individual player's chance of coming under attack. However the extremely high volume of players on this world may make lag an issue for players with lower-performance computers. Alternately, a magic golem outfit or a complete set of any shark outfit will render the creatures docile, allowing players to use any world.

Using an augmented pickaxe of earth and song , having 99 mining with a skillcape equipped, a lava titan familiar summoned, legendary quarrymaster activated, drinking a juju mining potion and wearing a magic golem outfit, one can gain at least 8500 item xp per hour

The low health of these deposits mean high-level miners will receive ore on almost every other swing. Thus, players using a perfect juju mining potion with signs of the porter and a stack of coal stone spirits will refresh their stamina almost every other swing. Thus, despite their relatively low experience multiplier, concentrated coal deposits are some of the best mining nodes for AFK training.

Concentrated coal deposits are also the lowest-durability Mining node that can yield igneous and metamorphic geodes, and thus the best source of metamorphic geodes in the game.

Mining

Concentrated coal deposit
Mining level		70		Critical hit chance
Output		Coal		10%	15%
Core				25	-
Stone spirit		Coal		Rockertunity multiplier
Geode		Igneous		x5	x6
Rock stats				21	-
Durability		500		Double ore chance
Hardness		140		5%	10%
Multiplier		0.8		27	-
Base ore		5		Geode chance
Varrock armour double chance				10%	15%
		4%		23	-

Update history

The update history project is a work-in-progress – not all updates to this topic may be covered below. See here for how to help out!

• patch 15 March 2010 (Update):
  • Concentrated coal deposits no longer turn gold during their animation.

Trivia

• Prior to the Mining and Smithing rework, concentrated coal deposits would collapse, and could not be mined from until it replenished itself, which would happen after a random delay. Unlike most Mining rocks, no competition existed for resources when mining from concentrated coal deposits.
• The mining skill guide states the level needed to mine the deposit is 77, however this is wrong.
• Mining is sometimes a daily challenge for the Mining skill.
  • Mining harmonised coal rocks in the Trahaearn district in Prifddinas would count as concentrated coal rocks for daily challenges.

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