> this is a minecraft mod, which includes a "prospecting" mechanic.. when doing the longer range "density search", it outputs messages for different kinds of ore like low/medium/high, but also a % number.  i'm
  trying to understand what this % number means.. it seems to defy interpretation

⏺ I'll help you understand what the % number means in the prospecting mechanic. Let me search through the codebase to find the relevant code.

⏺ Search(pattern: "prospecting|density.*search")
  ⎿  Found 7 files (ctrl+o to expand)

⏺ Let me search for more specific terms related to the percentage output:

⏺ Search(pattern: "low.*medium.*high.*%|%.*ore|percentage")
  ⎿  Found 4 files (ctrl+o to expand)

⏺ Let me look at the prospecting-related files to understand the density search mechanism:

⏺ Read(Systems/Prospecting/ItemProspectingPick.cs)
  ⎿  Read 390 lines (ctrl+o to expand)

⏺ Now let me look at the ProPickWorkSpace to understand how the readings are generated and what the percentage means:

⏺ Read(Systems/Prospecting/ProPickWorkSpace.cs)
  ⎿  Read 483 lines (ctrl+o to expand)

⏺ Now I need to look at the PropickReading structure to understand how the percentage is calculated. Let me search for it:

⏺ Search(pattern: "PropickReading|ToHumanReadable|PartsPerThousand")
  ⎿  Found 9 files (ctrl+o to expand)

⏺ Let me look at the PropickReading class to understand how the percentage is calculated:

⏺ Read(Systems/Prospecting/OreMapLayer/PropickReading.cs)
  ⎿  Read 118 lines (ctrl+o to expand)

⏺ Now let me look at the OreReading structure to understand what PartsPerThousand actually represents:

⏺ Search(pattern: "class OreReading|struct OreReading", output_mode: "content")
  ⎿  Found 11 lines (ctrl+o to expand)

⏺ Now I need to understand how PartsPerThousand is calculated. Let me look at the DepositVariant's GetPropickReading method:

⏺ Search(pattern: "GetPropickReading", output_mode: "content")
  ⎿  Found 91 lines (ctrl+o to expand)

⏺ Perfect! Now I found the key calculation. Let me examine the DiscGenerator's GetPropickReading method more closely:

⏺ Read(Systems/WorldGen/Standard/ChunkGen/5.GenDeposits/Generators/DiscGenerator.cs)
  ⎿  Read 30 lines (ctrl+o to expand)

⏺ Let me find the actual GetPropickReading method in the DiscGenerator:

⏺ Search(pattern: "ppt = relq \* 1000", output_mode: "content")
  ⎿  Found 21 lines (ctrl+o to expand)

⏺ Perfect! Now I understand exactly what the percentage means. Let me also check how it's displayed in the ToHumanReadable method. Looking back at that method at line 58 in PropickReading.cs:

  Based on my analysis of the code, I can now explain what the % number means in the prospecting density search:

  The % number represents "parts per thousand" (‰) of ore blocks expected in that chunk column.

  Here's how it's calculated in DiscGenerator.cs:396-403:

  1. quantityOres = totalFactor * absAvgQuantity - calculates expected number of ore blocks
  2. qchunkblocks = mapheight * chunksize * chunksize - total blocks in the chunk column
  3. relq = quantityOres / qchunkblocks - ratio of ore blocks to total blocks
  4. ppt = relq * 1000 - converts to parts per thousand

  So if you see "2.5%", it means approximately 25 blocks out of every 1000 blocks in that vertical chunk column are expected to be that type of ore. It's essentially the ore density expressed as parts per thousand
   (‰), but displayed with a % symbol.

  The percentage doesn't refer to certainty/probability, but rather to the actual concentration/density of ore blocks you can expect to find when mining in that area.

> so an ultra high 30% would be 300 out of 1000?

  is it checking the actual ores generated in that chunk, or just reading generation metadata without repsect to what was generated?

⏺ Looking at the code, yes, 30% would mean 300 out of 1000 blocks are expected to be ore.

  However, it's reading generation metadata, not actual generated blocks. Here's what it's doing:

  In DiscGenerator.cs:389-403, the calculation uses:
  - oreMapFactor - from the ore map (generation probability data)
  - rockFactor - from analyzing the rock column to see what percentage is suitable host rock
  - absAvgQuantity - the configured average quantity for this ore type

  So it's calculating the theoretical density based on:
  1. How strong the ore generation signal is at that location (from ore maps)
  2. How much suitable host rock exists in the column
  3. The ore type's configured generation parameters

  It's not counting actual ore blocks that were placed. This means:
  - The reading shows what should be there based on generation rules
  - Actual results may vary due to randomness in generation
  - If chunks haven't been generated yet, it still gives a reading
  - The reading represents the generation system's "intent" for that location

  This is why it's called a "density search" - it's predicting ore density based on the underlying generation parameters, not surveying what's actually there.

> /cost
  ⎿  Total cost:            $0.3265
     Total duration (API):  59.1s
     Total duration (wall): 6m 21s
     Total code changes:    0 lines added, 0 lines removed
     Usage by model:
         claude-3-5-haiku:  682 input, 89 output, 0 cache read, 0 cache write ($0.0009)
            claude-sonnet:  58 input, 1.9k output, 397.8k cache read, 47.5k cache write ($0.3256)