Requires the library mod Hybrid.

Ore Harvester is a QoL mod (a Hytale Java plugin) that allows players to mine entire ore veins instantly by holding crouch. It makes finding resources less tedious. By default, any ore in the vein is dropped at the first block's position. And players must crouch to enable the functionality. Each ore mined lowers the tool's durability.

The mod is highly configurable and can be tweaked to your own preferences.

Configurable: ( how do I configure? )
enableOreHarvester (default = true)
playerMustCrouch (default = true)
mustHoldPickaxe (default = true)
dropOresAtFirstBrokenBlock (default = true)

decreaseDurabilityPerHarvestedOre (default = true)
durabilityPerHarvestedOre (default = 1.0)

Showcase:
The player mines the entire copper vein instantly, while crouching:

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You may freely use this mod in any mod collection, as long as the download remains hosted within the CurseForge ecosystem.

Serilum.com contains an overview and more information on all mods available.

Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!