Imari leads a hunt for manganese ore, when the group encounters a mystery along abandoned railroad tracks.
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1. The sound of beating rain
and stirring treetops filled the night.
2. Before long, a single bright ray of light
pierced through the darkness.
3. Braving the storm was a rushing locomotive.
4. Stacked beyond the limit, the manganese ore
clicked as it spilled over.
5. The locomotive screeched to a stop
upon the emergency brake command.
6. The metallic scraping of wheels
against the rails echoed in the night.
7. The track technician rushes over.
8. "What happened? An air raid?"
9. "No, sir! It's the storm..."
10. The Men Who Carried Ore
11. The Men Who Carried Ore
12. The Men Who Carried Ore
13. The Men Who Carried Ore
14. The Men Who Carried Ore
15. The Men Who Carried Ore
16. The Men Who Carried Ore
17. The Men Who Carried Ore
18. The Men Who Carried Ore
19. The Men Who Carried Ore
20. The Men Who Carried Ore
21. The Men Who Carried Ore
22. The Men Who Carried Ore
23. Imari!
24. Jeez.
25. What's the matter, Arato-senpai?
26. Sorry!
27. Sentence to an Abandoned Railroad
28. Sentence to an Abandoned Railroad
29. Something came up, so
I can't go on the hunt tomorrow.
30. Oh, okay...
31. I was looking forward to seeing
a mine from the early Showa era.
32. Look! It's a novel that's said
to be based on that mine!
33. It's said to be quite accurate
and is such a good read!
34. Isn't it so cool to see fresh,
new ways to publish information?
35. Oh well. Maybe another time.
36. No worries, everyone else can go.
37. Huh?
38. I'll give you the directions
and precautions later.
39. After that, it's up to you.
40. Huh?
41. Don't tell me...
42. So! T-Today, um, we'll be going to a
manganese mine that closed in the Showa era
43. to hunt for pink manganese ore.
44. As for our route...
45. We'll start on the trail, then head
into the mountains to find the old tracks.
46. Old train tracks
47. Hiking trail
48. Bridge
49. After passing through the bridge and tunnel,
we'll arrive at the mine entrance.
50. Tunnel
51. Tailings
52. Once we're there, we'll hunt for ore
from discarded rocks called tailings.
53. Mine
54. Tunnel
55. Tailings
56. Mine
57. Will you be okay without Nagi-san?
58. I-I got it!
59. I'm more worried than you are!
60. We'll be fine with Imari-san leading the way!
61. Don't rely on me so much!
62. Uh, okay then... let's start...
63. Over there! That looks right. I think.
64. Think?
65. Okay!
66. A-All right! We're off!
67. Imari-san, you gotta take the lead.
68. Oh yeah, I go first.
69. Good grief.
70. Now what?
71. Wait, what?
72. Um, Imari-san?
73. Oh, we climb this slope—
74. Imari-san!
75. Aw, man.
76. Come on, you gotta watch your step.
77. U-Um, I don't think you should
look at your map while walking.
78. Sorry, I'll be more careful.
79. See, I told you Imari-san's like this.
80. She's being extra careful for our sake.
81. Sorry I'm not a very reliable senpai...
82. Manganese
83. Umekawa
84. Um, it should be just down here...
85. Look! Train tracks!
86. This is it.
87. These tracks lead to the mine.
88. All the ore used to
be transported along here.
89. This sign indicates the speed limit.
90. It means trains need to stay under 65 km per hour.
91. The tracks look to be 1067 mm wide,
92. which is called a narrow-gauge track.
93. Oh! And—there! Look! Right here!
94. Imari-san!
95. Look out!
96. Whoops.
97. I'm totally fine.
98. Jeez! Remember what Seto-san
just warned you about?
99. I know, sorry.
100. Tanigawa-san, don't say it like that!
101. It's the same as that novel...
102. I might have found some manganese ore.
103. Maybe it fell out of the locomotive.
104. Wait, this isn't pink though.
105. I thought you said that manganese ore was pink.
106. Manganese Dioxide
107. Actually, when left outside,
manganese ore oxidizes and turns black.
108. It's even used to make black paint.
109. The Lascaux cave paintings were
drawn using manganese ore, too.
110. Lascaux cave paintings
111. Manganese... I wonder what
its usage might be today.
112. Manganese batteries, I bet.
113. Manganese
114. It's even in the name.
115. Manganese ore easily oxidizes.
116. In other words, it's prone
to bonding with oxygen.
117. It's actually used in steel manufacturing to
remove oxygen, which can act as an impurity.
118. Cool!
119. Steel manufacturing...
120. Wow, Imari-san!
121. In a world with so many black rocks,
122. how can one differentiate
manganese from the rest?
123. Huh? Uh, um...
124. Maybe if we crack it open?
125. Of course!
126. It's pink!
127. Let's see...
128. Looks like manganese ore named
after roses called rhodonite, I think.
129. Roses?
130. Weird, it's not translucent like other rocks.
131. Almost like it was painted pink!
132. Who knew that such a bright color
was underneath this black rock.
133. They're pretty common in manganese sites.
134. Rhodonite is considered
low grade for industrial use,
135. so we'll probably find tons in the tailings.
136. Tons of pink rocks?
137. I'm excited!
138. That piece is pretty.
139. They really do look like roses.
140. All right! Let's hurry to the mine entrance!
141. Okay!
142. Yeah!
143. We should be able to go
down into the valley soon.
144. I bet it's this!
145. It's a downhill slope!
146. I got you.
147. Whoa. A steel bridge.
148. They built one this deep in the mountains?
149. Yeah.
150. Amazing, isn't it?
151. Here we go.
152. Back along the tracks.
153. Thank goodness.
154. So far, so good.
155. Since that bridge was still there,
156. do you think the rest
of the mine is intact, too?
157. What if we see a locomotive?
158. Seto-san, are you interested
in mines, by chance?
159. Well, I'd like to see one
if we get the chance.
160. I wonder what kind of lives people
led around here mining rocks.
161. Like what time they woke up, what
they ate, the kind of work they did...
162. Minerals themselves are interesting,
163. but I'm just as attracted to the nature and
people involved, and the changing times.
164. Wow, I totally get it! Me too!
165. Mineral resources are essential to our lives,
166. but we barely know anything about
how they were actually mined.
167. It's not even in many historical records.
168. That feels like such a waste to me!
169. Imari-san, I can tell
how much you love mines.
170. Of course!
171. Now, let's keep going and look around.
172. Okay!
173. No way...
174. Nagi's Respite
175. There are no strict rules about the origin of stone for railway track ballast, as long as it's hard, not prone to wear or absorbing water, and doesn't cause environmental harm. Commonly used stones include volcanic rocks like andesite and basalt, which can be found in large quantities.
So, where does this stone come from? For example, East Japan Railway Company sources its ballast from its own quarries located in places like Saigane Station in Ibaraki Prefecture, Onogami Station in Gunma Prefecture, and Hatsukari Station in Yamanashi Prefecture.
Because transporting heavy stone is costly and difficult, railway companies usually use material from nearby quarries. In fact, stone quarried near Saigane Station is used in Ibaraki and Chiba Prefectures.
In this way, track ballast reflects the unique geological characteristics of each region.
176. They're all stones from different sources
177. We ran
out of
manganese,
so
this
will
do
178. Nagi's Respite
179. Minerals have long been used for many purposes—one of which was making paint. Blue and green pigments were often made from minerals, while black was usually made from charcoal instead. Produced simply by burning wood, charcoal has been found in wall paintings around the world dating back to prehistoric times.
Interestingly, manganese dioxide doesn't produce a noticeably different black color compared to charcoal. So the fact that the artists went out of their way to use a material so hard to get suggests they had a special intention in mind. Yet scientific analysis has shown that not all parts of the Lascaux paintings use manganese dioxide. In some areas, the black pigment was substituted with a "dark-colored soil" found inside the cave itself.
The fact that modern science was needed to uncover this detail goes to show that even at the time, using manganese dioxide was not the most practical choice. But it ended up painting a picture of the artists' efforts—not just to paint, but to express something deeper—something profoundly human.
180. Splat
181. No way...
182. We should have been
able to go through here.
183. It must have collapsed recently.
184. You mean the ceiling caved in inside?
185. Hey, wait! You shouldn't get too close!
186. Imari-san! Isn't there another way around?
187. Imari-san?
188. Imari-san!
189. O-Oh! Um...
190. Other routes would take too much time.
191. I thought we could pass through here,
so I didn't plan for any detours.
192. Umekawa
193. Caution! Cliff on right side!
194. Be careful not to drop
rocks on people
when climbing slopes.
195. Alert people loudly
if rocks do fall!
196. Hydrate every
30 minutes!
197. Don't forget
electrolytes
198. Remind the others!
199. We're almost there.
200. It's only a bit longer
until we reach the mine.
201. You got it?
202. If I can grab on here.
203. Almost there.
204. Got it!
205. You okay?
206. Thanks, Imari-san.
207. Are you both okay?
208. Look good?
209. No twisted ankles or anything?
210. I'm glad you didn't get hurt.
211. Let's go home.
212. What?
213. No way, we can climb up here!
214. She's right, we came all this way!
215. Thanks, you two.
216. But I'm not sure I can keep
you both safe beyond this point.
217. We'll be fine! We'll figure it out.
218. Nope. Maybe if it were Arato-senpai.
219. Sorry, I couldn't do it myself.
220. N-No! You don't need to apologize, Imari-san.
221. Ugh, you're right.
We can't risk anyone getting hurt.
222. Which would most likely be Imari-san.
223. Hey, that's taking it too far.
224. I was just kidding.
225. Some things are better off unsaid.
226. It's disappointing, but can't be helped.
227. If only...
228. If only there were
somewhere else we could look.
229. What if we could look along the tracks?
230. Look for what?
231. The locomotive carried ores,
so what if some fell out along the way?
232. I don't think we saw any except this one.
233. But we weren't necessarily
looking the whole way.
234. We were so caught up in reaching the mine.
235. You're so right! Totally!
236. That settles that!
237. Let's head back while searching for ore!
238. They're black, so it shouldn't be hard to find.
239. Where might rocks fall?
240. What about the outer sides of curves?
241. They might fall from centrifugal force!
242. There isn't a single one here.
243. Ugh...
244. We're back where we started.
245. Should we head home?
246. We still have a bit of time, but—
247. Then let's keep following the tracks!
248. Yeah!
249. All right!
250. None here, either.
251. Maybe I was wrong.
252. I guess this is just how it goes sometimes.
253. Imari-san!
254. We found some!
255. They're over here!
256. Manganese ore!
257. Really?
258. Look at all these black rocks!
259. There's a ton more.
260. Wow.
261. They definitely look like manganese ore, but...
262. See?
263. There's too many of them
to have just fallen out.
264. Let's crack 'em open!
265. What does this spot signify?
266. Black rocks... piled together?
267. There's even more over there.
268. Look at all of them!
269. Nice! Time to get crackin'!
270. Y-Yeah, let's do it.
271. Does this mean... they used ore as ballast?
272. But that makes no sense.
273. It doesn't?
274. Whoa, rhodonite! Yay!
275. Great job!
276. Imari-san, it's just like you said!
277. R-Right.
278. All right, it's on for real now!
279. Same here!
280. Could they have used
leftover tailings as ballast?
281. But that's totally out of the norm.
282. What happened here?
283. Imari-san!
284. Look! We found something else.
285. A ton of crystals that look like gems!
286. Wow, what an amazing lump of crystals!
287. It's pink, so is this rhodonite too?
288. Imari-san, can you tell?
289. I thought it might be something more special.
290. Hmm...
291. These crystals are parallelograms.
Or I should say rhombohedral.
292. Pink rhombuses... Manganese...
293. I think it might be rhodochrosite.
294. It's not rhodonite?
295. I thought it looked different.
296. Rhodochrosites are considered
higher in grade than rhodonites.
297. Rhodonite
298. Rhodochrosite
299. Manganese content
below 42%
300. Manganese content 46-47%
301. In reality, impurities
typically lead to a
manganese content
of roughly 30%.
302. Regarded as the
highest grade
manganese
content in ore
303. They must have gotten mixed into the tailings.
304. Wow, who knew something
so valuable would be left here.
305. We're lucky we could find them!
306. I'm not sure if we can say we're lucky.
307. Tailings aren't supposed to be used
as ballast in the first place.
308. Huh? Why not?
309. Ore often contains concentrated
elements that aren't typically
310. found on the Earth's surface,
so if it contains toxic substances...
311. The rain could wash them out
into the environment.
312. Exactly.
313. Even minerals as seemingly
harmless as pyrite can
314. Pyrite
315. produce sulfuric acid when
exposed to water and oxygen.
316. Water
317. Oxygen
318. Iron
sulfate
319. Sulfuric
acid
320. S-Sulfuric acid?
321. What? So they used these
even though it's not allowed?
322. I wonder what they were thinking...
323. I'm not sure, either.
324. Even if they were reusing
tailings they didn't need,
325. why just here and nowhere else?
326. Well, it's not like we can ask now.
327. Yeah... it's too far in the past.
328. Another one!
329. I thought I'd only find one, but there's
so many of these rhodochrosites!
330. Here's one, too!
331. Lemme see! Nice, that's a big crystal!
332. Yours has a great color, too.
333. This spot's full of rhodochrosites...
334. No way.
335. This is awesome.
336. I'm having so much fun!
337. More! And more!
338. Look at all these crystals!
339. This one might be rhodonite?
340. I'm not sure.
341. Imari-san!
342. Whatcha staring at?
343. Is there something about that rock?
344. Yeah.
345. The ballast here isn't actually tailings.
346. It's all high-grade ore.
347. You mean because of all these rhodochrosites?
348. These were supposed to be delivered
to the factory. I'm sure of it.
349. So they used valuable rocks for ballast?
350. Why would they do that, Imari-san?
351. I don't know.
352. Phew!
353. I'm just glad we got back in one piece.
354. Even though I couldn't
figure out that last part...
355. It's so pretty.
356. There's so much I need to learn.
357. The Men Who Carried Ore
358. Oh yeah, I never read the ending.
359. What happened? An air raid?
360. No, sir! It's the storm.
361. It washed away all the ballast.
362. Dammit. Not again.
363. Hey! You there!
364. Where's the backup ballast?
365. We used up the rest during the last repair.
366. I'll urge them to send some more
as soon as possible,
367. but we'll have to halt operations until then.
368. No! Resume operations immediately!
369. It's impossible! We have
no choice without rocks—
370. What are you...?
371. You're not planning to use those, are you?
372. I am.
373. Wait! That's valuable manganese ore!
374. Besides, what about all the regulations?
375. We can't delay the supply!
376. Do it! I'll take responsibility.
377. Come give me a hand!
378. Fill the tracks with these!
379. Y-Yes, sir!
380. Wait a second...
381. Chumo Newspaper
382. Consecutive Typhoons
383. Delayed repairs across Japan
384. Manganese Mine Damage
385. Rising Demand for Steel Production
386. The same thing happened at that spot!
387. Oh, Imari. You're back?
388. Arato-senpai!
389. How was the hunt? Find anything?
390. I found an amazing spot!
391. Yeah?
392. I wonder when Ruri-chan
and Seto-san will visit next.