You might be able to make use of Asphyxia in order to implement arsenic fumes.

Hello, If necessary, make it fully compatible with the wonderful Geology Additions mod.

Yes i know about bugs. I will take a break after work and finish this mod, please sorry

Game throws this error whenever you try to prospect and fails to show prospecting results. I only have Fahl loaded and it is up-to-date (1.16.1 game version and 1.0.2 mod version)

[Error] System.NullReferenceException: Object reference not set to an instance of an object.
at Vintagestory.ServerMods.ChildDepositGenerator.GetYMinMax(BlockPos pos, Double& miny, Double& maxy)
at Vintagestory.ServerMods.DiscDepositGenerator.oreBearingBlockQuantityRelative(BlockPos pos, String oreCode, Int32[] blockColumn)
at Vintagestory.ServerMods.DiscDepositGenerator.GetPropickReading(BlockPos pos, Int32 oreDist, Int32[] blockColumn, Double& ppt, Double& totalFactor)
at Vintagestory.GameContent.ItemProspectingPick.PrintProbeResults(IWorldAccessor world, IServerPlayer byPlayer, ItemSlot itemslot, BlockPos pos)
at Vintagestory.GameContent.ItemProspectingPick.ProbeBlockDensityMode(IWorldAccessor world, Entity byEntity, ItemSlot itemslot, BlockSelection blockSel)
at Vintagestory.GameContent.ItemProspectingPick.OnBlockBrokenWith(IWorldAccessor world, Entity byEntity, ItemSlot itemslot, BlockSelection blockSel, Single dropQuantityMultiplier)
at Vintagestory.Server.ServerSystemBlockSimulation.TryModifyBlockInWorld(ServerPlayer player, _zQRtckuwZGriQ6yzmHpCEVJBkot cmd)
at Vintagestory.Server.ServerSystemBlockSimulation.HandleBlockPlaceOrBreak(_lED4KdC91wgZEt0DdnlBksEk38A packet, ConnectedClient client)
at Vintagestory.Server.ServerMain.ProcessNetMessage(NetIncomingMessage msg, NetServer mainSocket)

I'm going to add that this mod still breaks vanilla metallurgy (can't smith or cast toolheads with any vanilla metals) but it isn't showing any errors in the log. Also, a handful of tools (such as the arsenic-bronze scythe and propick) have no values and break instantly upon use. I'm not really sure if it is my own game causing this but these bugs keep occuring despite freshly reinstalling the game, starting new worlds, and having no other mods loaded to avoid conflicts.

Thanks for bugs, i tested on 1.15.10, cause of no c# code, just vanilla json patching. Retest and fix later

I also want to point out that this mod in its current state totally breaks vanilla metallurgy. You are unable to cast tools (copper never hardens in toolhead casts for instance) and you are unable to work vanilla ingots on anvils into toolheads. It also breaks their textures when they are sitting on a forge. Adding and removing the mod repeatedly revealed this correlation but there is nothing in the debug logs showing any errors signifying this. No other mods are loaded. I was able to load the mod earlier by changing 'both' to 'client' in the .json.

The mod is failing to load in the new update (1.16.1)

24.1.2022 23:04:21 [Error] [FahlOres.zip] An exception was thrown trying to to load the ModInfo:
Newtonsoft.Json.JsonSerializationException: Error converting value "Both" to type 'Vintagestory.API.Common.EnumAppSide'. Path 'Side', line 14, position 16. ---> System.ArgumentException: Requested value 'Both' was not found.
at System.Enum.TryParseEnum(Type enumType, String value, Boolean ignoreCase, EnumResult& parseResult)
at System.Enum.Parse(Type enumType, String value, Boolean ignoreCase)
at Newtonsoft.Json.Utilities.EnumUtils.ParseEnumName(String enumText, Boolean isNullable, Type t)
at Newtonsoft.Json.Converters.StringEnumConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
--- End of inner exception stack trace ---