Developed haulage off pan shearer ，for the first time achieved a minimum limit of thin seam mining height 0.56m mechanized mining.

1. Beijing HOT Mining Tech Co Ltd
北京浩沃特矿业技术有限公司
Beijing  Chengdu  Sydney  Guatemala Santiago Zambia
 北京  成都  悉尼  危地马拉  圣地亚哥  赞比亚 Web: www.hot-mining.com

2. Thin/Low Coal Seam Mining Technology
薄煤层综合机械化开采

3. 浩特简介 About HOT
HOT Mining provide integrated engineering solutions to coal and minerals.
Our services include underground mining, open cut mining, mineral processing and
materials handling. We provide engineering, equipment, project delivery, operations
And off-take services for coal, iron ore, copper, gold, zinc, silver and other base metals.
北京浩沃特矿业技术有限公司（简称『浩特』）
国家级高新技术企业，中关村“金种子工程”企业，国家中小企业引导基金清控银杏战略投资企业。
致力于提供 资源业设计-交付-运营-包销的“一站式”服务。
HOT is leading in 3D engineering and intelligent operation in coal preparation. We’re
The first company who developed 3D engineering methods successfully in China.
There are only a few companies can provide the Bigdata based intelligent operation system
For CHPP worldwide. HOT is one of them.
浩特是业内 三维工程和智能运营系统的领导者，在中国最早开发出用于矿物加工的
三维工程设计方法；世界范围内，仅有少数公司可以提供 基于大数据架构的选矿智能化系统，
浩特是其中之一。

4. 煤业服务 Services to Coal
• 煤业经验丰富 Experienced in Coal Mining and Washing
HOT Mining has rich experience in low coal seam mechanization mining engineering, complete
equipment supply and technical support for more than 50 low coal seam projects, more than 60
projects of coal washing plant design, construction, project delivery in mining, materials handling,
浩特的工程师团队拥有超过50个薄煤层综合机械化开采项目的供货, 交付, 长期技术支持经验（博业）
超过60个大型选煤厂的设计、建设及项目交付经验。
• 知名客户 Famous Clients
Our coal engineering capability has been recognized by mining giants. Our clients are
Rio Tinto, Anglo American, Worley Pasons, Shenhua, Xstrata Coal，etc.
浩特的煤业技术及服务已经获得国内外知名矿业公司的认可，客户包括：
力拓、中国神华、英美矿业、沃利派森、嘉能可.超达 (煤业)等世界500强的顶级矿业公司。
• 国际化基础 International Presence
HOT has already established branch or office in Australia, India, Zambia, Guatemala and Chile
已在澳大利亚、印度、赞比亚、危地马拉、智利等矿业国家与当地知名服务商建立了办事处或分公司。

5. 浩特的“第一”High lights of HOT
1. The 1st engineering company from China which got the qualification of main project engineering and equipment supply of Rio Tinto.
At the end of 2014, Rio Tinto prepared the Hunter Valley MTP CHPP project, capacity: 12MTPA
HOT Mining has passed the qualification examination of engineering supplier, now this project is in preparation.
中国第一家，目前唯一一家获得力拓主体项目设计及项目类供应商资格的工程公司
2014年底，力拓筹备位于悉尼附近的猎人谷矿区的MTP选煤厂项目，规模：1050万吨/年 (可行性研究+初步设计)
2. The 1st engineering company from China which do engineering consultant and technical supervision for local
Australian CHPP project.
The COOK coal mine and CHPP upgrading project which located in Black Water, Queensland, Australia is belonged to Xstrata-GRAM.
Capacity: upgraded from 0.6MTPA to 3.5MTPA (first stage).
HOT Mining’s core member is the jury and director of the underground mining and CHPP part, providing
full-course technical consultant and part of equipment supervision services.
中国第一家，为澳洲本土的主体矿山项目，做工程咨询及技术监督的工程公司（业主方工程师）
Xstrata – GRAM 合资公司（嘉能可.超达，广晟），位于澳大利亚昆士兰州 Black Water的COOK煤矿及选煤厂升级改造项目。
规模：从60万吨/年提升至350万吨/年（第一期）；总投资约1.85亿美元。
HOT的核心成员是该项目，井采、选煤厂的主任评委，并提供全程工程技术咨询、部分设备监造等服务。
3. The 1st engineering company from China which provides engineering and crucial equipment for Anglo America.
HOT provided engineering, complete equipment supply of crushing and grinding system for Anglo America’s gold mine project in Congo.
英美矿业投资在刚果（金）的金矿项目，HOT提供破磨系统的全部设计、核心设备供货、技术支持等。

6. 金融支持能力 Financial Capabilities
HOT is capable of Financial Leasing & Export Credit. Financial partners are
states-owned companies such as ZhongGuanCun Science-tech Leasing Company Ltd,
BOC International (China) Ltd, and etc.
HOT could provide financial leasing for mining and mineral processing equipment,
and export credit for important projects.
目前HOT已经与 中关村科技租赁、中银国际、厦门国贸集团 等融资机构建立起合作。
能提供采、选设备的融资租赁（国内）；
以及重点项目的出口信贷等服务（国际）。

7. 业务板块 Four Major Business - 1
Open Cut
Mining
露采
工程设计

8. 业务板块 Four Major Business - 2
Underground Mining 井工开采

9. 业务板块 Four Major Business - 3
Process
矿物加工
选煤厂
Coal Washing Plant  Screening & Crushing  Sands Washing  Slime Drying System
选煤厂  破碎筛分系统  砂石生产线 煤泥干燥系统

10. 业务板块 Four Major Business - 4
Underwriting Sales
矿产品包销
1. 铜精粉进口
2. 萤石进口
3. 重晶石出口

11. 3D ENGINEERING Design 三维工程设计
3D Concept Design
3D 概念设计
3D Structural Design
3D结构设计
3D Detialed Design
3D 详图设计

12. 3D DESIGN ON 三维非标件设计
FABRICATED PARTS
HMV Clean Coal
Screen
Fabricated Design
HMV 精煤筛机备件
设计加工
Pressure Filter
Fabricated Design
压滤机备件设计加工

13. 3D Engineering - Coal Preparation Plant 三维设计的选煤厂

14. 3D Design ON STRUCTURAL 三维设计的钢结构
Fabricated Steel Structure
Design

15. HOT Mining Projects & Engineers Experiences on Low Coal Seam
Longwall Mining Unit & CHPP
(Including coal shearer OEM factory performance)
浩特公司薄煤层综采成套及选煤厂项目业绩
（含采煤机OEM工厂业绩）

16. Client Name 使用单位 Model 型号 Quantity 数量
重庆松藻煤电有限公司石壕煤矿 MG465-DW薄煤层采煤机 1台
重庆天弘矿业有限公司盐井一矿 MG200/468-BWD交流变频电牵引采煤机 1台
重庆天府矿业有限责任公司三汇三矿 MG200/468-BWD交流变频电牵引采煤机 1台
重庆松藻煤电有限公司梨园坝煤矿 MG468-BWD采煤机 1台
重庆永荣矿业有限公司曾家山煤矿 MG160/388-BWD交流变频电牵引采煤机 1台
重庆永荣矿业有限公司中梁山武隆煤矿 MG160/388-BWD交流变频电牵引采煤机 1台
重庆市永川区金山煤矿 MG468-BWD采煤机 1台
重庆永荣矿业有限公司韦家沟煤矿 MG200/468-BWD交流变频电牵引采煤机 1台
重庆永荣矿业有限公司永川煤矿 MG160/388-BWD交流变频电牵引采煤机 1台
湖北宝源广德资源有限公司 MG468-BWD采煤机 1台
泸州远大煤业有限责任公司 MG200/468-BWD交流变频电牵引采煤机 1台
七台河银杏煤矿 MG468-BWD采煤机 1台
四川省威远县三强煤矿 MG200/468-BWD交流变频电牵引采煤机 1台
四川省顺通矿业集团有限公司 MG200/468-BWD交流变频电牵引采煤机 1台
贵州贞丰正大煤矿 MG130/328-BWD交流变频电牵引采煤机 1台
四川省威远县三强煤矿 MG130/328-BWD交流变频电牵引采煤机 1台
重庆永荣矿业有限公司中梁山武隆煤矿 MG468-BWD采煤机 1台
四川省达州市大竹县贺家湾煤矿 MG200/468-BWD交流变频电牵引采煤机 1台
四川省威远县俊龙煤矿 MG130/328-BWD交流变频电牵引采煤机 1台
四川省威远县永高煤矿 MG130/328-BWD交流变频电牵引采煤机 1台
四川省宜宾市翠屏区凉姜乡新鑫煤矿 MG200/468-BWD交流变频电牵引采煤机 1台
重庆永荣矿业有限公司中梁山武隆天宝煤矿 MG160/388-BWD交流变频电牵引采煤机 1台
贵州毕节湖北宜化永佳煤矿 MG200/468-BWD交流变频电牵引采煤机 1台
七台河潘琦煤矿 MG130/328-BWD交流变频电牵引采煤机 1台
贵州贞丰高家岩煤矿 MG468-BWD采煤机 1台
重庆中梁山煤电气有限公司邵新煤矿 MG200/468-BWD交流变频电牵引采煤机 1台
荥经县更兴煤业有限公司 MG468-BWD采煤机 1台
重庆永荣矿业有限公司永川煤矿 MG130/328-BWD交流变频电牵引采煤机 1台
七台河市机电有限责任公司煤矿 MG160/388-BWD交流变频电牵引采煤机 1台
四川省宜宾市翠屏区凉姜乡新鑫煤矿 MG200/468-BWD交流变频电牵引采煤机 1台
薄
煤
层
采
煤
机
部
分
业
绩
CoalShearerUsedinLowCoalSeam

17. 序号
Item
项 目 名 称
Clients & Projects
选煤厂类型
Type of CHPP
建设规模
Capacity
服务内容
Services
1
永晖焦化集团---策克选煤厂 (中蒙边境)
Winsway---Ceke CHPP --- close to the border of
Mongolia and China
炼焦煤选煤厂
Coking CHPP
4.0Mt/a
可研/初步设计/施工图
FD/CD/ED
International Projects Experience（Part） 国际项目业绩 (部分)
2
力拓猎人谷MTP选煤厂项目
Rio Tinto MTP Thermal Power CHPP --- Australia
动力煤选煤厂
Thermal CHPP
10.5Mt/a
可研设计
Feasibility Study
3
英美黄金刚果（金）金矿选矿项目
Anglo Gold Ashanti ---DRC Mongbwalu Processing Plant
金矿选矿 250TPH
设计 / 供货 / 技术服务
Engineering, Supply,
Technical Services.
4
伊朗矿业部SAMAN煤矿东区薄煤层成套供货
Iran SAMAN East Part Longwall Units Supply
薄煤层
Low Coal Seam
0.45Mt/a
成套供货 (2016中标)
Unit Supply
International Project Experience Since 2012
国际项目业绩
5 澳大利亚卡利登 井采成套及选煤厂
Caledon Cook CHPP --- Australia
(Xstrata & GRAM Joint Venture)
炼焦煤煤矿
+ 选煤厂升级
Coking CHPP
3.5 Mt/a 技术咨询 、采购支持
Engineering &
Sourcing Supports
6 土耳其ABH集团Hamal露天煤矿预可研
Anadolu Birlik Holding (ABH) --- Konya Coal Zone
In Turkey
3个露采预可研
Pre-Feasibility
Study for 3 open
cut mining
7.8 Mt/a 预可研
Pre-Feasibility Study

18. Why HOT Know How? 为什么选择HOT提供薄煤层成套？
-How to develop Low-Seam Underground Coal Mining?
Coal mines in southwest China are difficult mining which mostly belong to the low, steeply pitching and faults reserved coal
seam; experts of HOT are the people who have many years’ experience in low coal seam mechanized mining and production
management engineers from Chongqing Coal Group, Sichuan Coal Group and Yunnan Coal Chem Company, etc.
中国西南地区的煤矿多属于薄煤层、急倾斜、断层多的难开采煤矿；
HOT的专家来自重煤集团、川煤集团、云南煤化等具有多年薄煤层机械化开采实施、生产管理的工程师。
Coal mining machine experts: Xiang-Dong Liu, he is awarded special government allowances by State Department,
one of the first batches of specialized technical talented person of the original ministry of coal industry. He is the 2013
national coal machinery industry outstanding chief engineer and he awarded second prize of Technology Progress of the
original ministry of coal industry. Mr. Liu is the founder of coal shearer OEM factory of HOT Mining, The independent director
of HOT, the Chongqing Coal Group consulting expert group leader. He has more than 30 years’s experience in research and
development of low seam coal mining machine and fully-mechanized longwall complete implementation.
采煤专家：刘向东，国务院特殊津贴获得者，原煤炭部首批专业技术拔尖人才，原煤炭部科技进步二等奖，2013年度全国煤炭
机械工业优秀总工程师。刘先生是HOT采煤机OEM工厂的创办人，现任HOT独立董事，重煤集团特聘专家组领头人。拥有超
过30年的薄煤层采煤机研发、制造、综采成套实施的丰富经验。

19. Fully-mechanized complete implementation and chief mining engineer: Fei Mao. He has many years’ experience in
underground coal mining management, equipment sourcing, equipment maintenances and technical development in the
field of low coal seam mining. He is cooperating with BHP Billiton, Vale and Guangdong Rising Group, with rich experience
in several large mine’s geological exploration, resource evaluation (Australian Standard JORC) and mining acquisitions. Mr.
Mao is the youngest Chinese member of Australian Coal Association.
综采成套及采矿专家：毛飞，博士。拥有多年的一线生产管理、设备招投标、设备采购、技术开发等采煤技术领域的经验。
并与必和必拓、淡水河谷、中国广晟等合作，拥有多个大型矿山的地质勘探、资源评价(澳洲JORC标准)、矿山并购的经验。
毛先生是澳洲煤炭领域最年轻的的中-澳联合专家组成员。
Low coal seam fully-mechanized management expert: Prior to join HOT Mining, Mr. Nengjun Yu, he is deputy general
manager of Yunnan Coal Chem Company and external expert of HOT. He has nearly 30 years’ experience of coal mine
production management. He guided Housuo Coal Mine and other similar projects to complete successful implementation of
low coal seam fully mechanized.
薄煤层综采管理专家：余能俊， HOT煤业顾问，原重煤集团天府矿务局总工程师，国家瓦斯专家组委员。
余先生拥有超过30年的煤矿一线生产管理、矿山建设、事故处理等经验。引导天府矿务局以及重庆能投集团下属煤矿等项目
成功实施薄煤层综采、大倾角综采、瓦斯抽放及综合利用等具有突破意义的代表项目。

20. Crucial point of implementation of low coal seam fully mechanized?
实施薄煤层综采技术，成功的关键点？
Most importantly: rich experience in similar projects
首要条件：具有丰富的类似项目实施经验
Necessarily: Integrated capabilities of complete system of shearer, road-header, scraper conveyor and hydraulic support
and counter-part systems.
必要条件：具备完整的“三机一架”及配套系统的成套整合能力
Low coal seam mining ground adjustment
薄煤层综采成套地面调试
MG薄煤层系列滚筒式电牵引采煤机
Drum: Low coal seam comprehensive mechanized
mining range 0.45m ~ 2.5m
滚筒式：薄煤层综合机械化开采范围: 0.45m ~ 2.5m
Plough: steep comprehensive mechanized
mining range 0.3m~0.6m, seam angle 30°~90°
刨煤机:急倾斜综合机械化开采范围: 0.3m~0.6m,
煤层倾斜角度30°~90°

21. Working Face Operation Monitoring
薄煤层工作面运行监测
Ground Units’ Co-Test
薄煤层综采地面测试

22. Ultra Low Coal Seam Mining 超薄煤层机械化开采
Developed haulage off pan shearer ，for the first time achieved a minimum limit of thin seam mining height 0.56m mechanized
mining.
Successfully wide used in ultra low coal seam below 800mm.
超薄煤层应用爬底板采煤机配套，最薄0.56米厚即可实施机械化开采。0.8米厚煤层已广泛应用。
Artisanal mining The comprehensive mechanized mining
The application of the technology, coal face yields 1.8 times, mining efficiency
increased by 3.38 times, tons of coal production cost was reduced by 63%.
在重煤集团、川煤集团等超薄煤层实施机械化开采后，每个工作面的平均产能提升1.8倍
，开采效率提升3.38倍。吨煤开采运行成本降低了63%。

23. Ultra Low Coal Seam Longwall 超薄煤层综采
Longwall method of Ultra Low Coal Seam
超薄煤层的综合机械化开采。
Sichuan BinLang Coal Mine 斌朗煤矿
Average Thickness of Coal Seam: 0.67m
Coal seam pitch: 12°- 15°
配套设备
Longwall Units
型号规格
Spec. & Type
爬底板采煤机
Off Pan Shearer
MG110/130-TPD
刮板输送机
AFC
SGB420/40
液压支架
Powered Hydraulic Roof Support
ZY2400/5.5/12X

24. Off Pan Shearer for Ultra Low Coal Seam
爬盘底板采煤机——超薄煤层定制机械化采煤设备
Model: MG100-TP
Mining height：0.50~0.95m
Web depth：0.65~0.95mm
Application field：It is used for
mining of super ultra low coal seam.
Corollary equipment usually is
SGB420/30 or SGD420/22 scraper
conveyer and single hydraulic prop.
Model Mining height
（M）
Drum web depth
（M）
Production
capacity
（T/H）
Max
haulage pull
(9KN）
Face
gradie
nt
Motor
power
（KW）
Dimensions（
MM）
Operating mode
MG100-TP
YPG3 0.50~0.95 0.65~0.95 70~120 117.6 <30 100 4580*910*375 Manual operation
YPG4 0.50~1.0 0.65~0.95 70~130 118 <35 100 4580*910*375 Manual operation
YPG5 0.50~1.0 0.65~0.95 70~130 118 <65 100 4580*910*375 Manual operation
and remote control

25. Working Face of Ultra Low Coal Seam Longwall
超薄煤层综采工作面
请观看超薄煤层机械化开采视频

26. Developed with our domestic partners, HOT-mining firstly realized the integrated and
mechanized mining technology for the edge seams（35-55°）.
HOT与国内技术伙伴共同公关，已经在四川省、重庆市的急倾斜煤矿中成功实施了机械化
综合开采技术,成功应用的急倾斜煤层角度为30°-55°。
The Steep Inclined Seams and Edge Seams Integrated
Mining Technology 急倾斜开采

27. Low Coal Seam
Longwall Mining Equipment
薄煤层综采成套核心设备

28. 四川嘉华神坤装备有
限责任公司
MG150/421-HOT 爬底板式采煤机
MG150/421-HOT off-pan outer traction
shearer
MG300(250)/722(622)-HOT AC牵引采煤机
MG300(250)/722(622)-HOT
Ac traction shearer
MG2×100/495-HOT AC牵引采煤机
MG2×100/495-HOT Ac traction
shearer
滚筒式薄煤层采煤机
“HOT-博业”品牌

29. Independently developed for different mining conditions of burial and big dip face
outfit (bracket, shearer, conveyor, dual horizontal end bracket), and achieved 16
patents.
独立研发的采煤机能应用于不同采煤埋藏条件和大倾角工作面，并且已获得了16项专利。
Frame between block
and gangue device
Before in the
gangue device
Auto-balancing
device
Scalable connection
device
Fault force
braking
Integrally cast
pin line
Trap device
Lateral push
unit
Hydraulic
support
Shearer
Scraper
conveyer
三机一架成套供货
One-Stop Supply of Longwall Mining

30. Horizontal lower end hydraulic support
Transversal arrangement
Pedestrians and coal separation
Noninterfering with the loader
Overall mobile whole sealing
Variable
angle
retractable
roof beams
Coal
channel
Walkways
Working Race Support: Hydraulic Roof Supports & Props
工作面支护设备：液压支架&支柱
Hydraulic Support液压支架 - OEM manufacturer OEM代工
Single hydraulic prop 单体液压支柱 - HOT brand HOT品牌
The third generation of the lower end
hydraulic support site layout

31. 四川嘉华神坤装备有
限责任公司
Steeply inclined Series hydraulic support
large dip angle large mining height hydraulic shield support

32. Underground Transportation System-
Suspended Mining Locomotive
井下设备及人员运输系统 – 单轨吊机车
HOT has brought in STAVUS advanced technology, which could improve the efficiency of working face removal and staff
transportation.
HOT引进了捷克STAVUS公司全球领先的单轨吊技术，极高的提升了工作面迁移和人员运输的效率。
Home-manufacturing process: the localization assembly work of parts and whole machine is in process, it’s hopeful to realize the
whole machine domestication.
国产化进程：部分零部件及整机的国产化组装工作正在筹备，有望在2016年实现在中国的整机国产化。

33. Coal industry is the pillar industry in China. As the increasing application of new technology in coal mine, it’s getting more important to change
transportation method into a more safe and convenient way.
Since 2004, diesel suspended mining locomotive has been adopted in domestic coal mine. They’re used for transportation of equipment, staff and
working face removal in extraction process, and achieved good benefit.
煤炭行业是我国的支柱产业。随着新的科学技术在煤矿工业的不断应用，发展高效快捷的辅助运输方式已经成为我国煤矿工业建设的一项重要任务。
自2004年以来，柴油动力单轨吊机车在国内得到一定程度的推广使用。在煤炭企业内，柴油单轨吊主要用于回采过程中生产资料、人员的运输和工作面
搬家，并取得了良好的经济效益。
As a transportation equipment, suspended mining locomotive has been applied for many years in western countries, and greatly improved the
transportation efficiency and coal production.
单轨吊车作为矿井辅助运输设备，在西方国家已经有近几十年的使用历史，较好地解决了煤矿辅助运输效率低的难题，对煤炭产量的提高起到了积极的作
用。
Application of Suspended Mining Locomotive
单轨吊机车的使用情况

34. Compared with normal transportation method, suspended mining locomotive doesn’t have the risk of derailing and fracturing with
the features of automatic power and bemannt system.
单轨吊是具备自助动力和有人驾驶的设备， 与普通运输相比，单轨吊无掉道、断绳、跑车的危险，大大减少了辅助运输安全事故发
生的概率，实现了好又快的安全生产。
Advantages of Suspended Mining Locomotive
单轨吊机车的优势
By using the suspended mining locomotive, it could decrease the transportation workers and improve transportation efficiency, which
means the reduction of cost of coal per ton, meanwhile, it could be used as the backup system for roadheader, which could save the
preparation time before installation.
运输效率的提高，运输人员的减少就意味着吨煤成本的降低，同时它还可以作为综掘机掘进的配套辅助运输系统，节省工作面安装前的
准备时间。

35. Suspended Mining Locomotive
单轨吊机车
It has been widely applied in Europe, South America and many advanced mining area.
单轨吊在欧洲、南美等矿业发达国家应用非常广泛。
Wide Application Range: It could be used in low coal seam, medium-thickness coal seam and inclined coal seam.
应用范围广：单轨吊在薄煤层、中厚煤层、倾斜煤层的运输系统中具有巨大的优势。
Safety and High Efficiency: It could complete works such as removal of working face, transportation of workers and working face
equipment safely and high efficiency.
安全高效：单轨吊可以安全、高效的完成工作面设备搬运、人员运输等工作。

36. 典型产品和解决方案：
视距遥控智能采矿系统

37. Super PPE for Miner
矿工可穿戴设备 （MA认证阶段）
力拓等矿业公司已经开始将可穿戴设备引入矿业生产实践。
HOT与澳大利亚ALPHA公司合作，基于电子皮肤开发的可穿戴设备能够实时监测:血氧含量、心率、呼吸频率、脑电波(α波)、
肌电波等数据；
经过算法分析操作人员疲劳度，从而减少危害人员安全的事故。
卡车司机、井下等一线人员、选煤厂一线操作工等。
现有的技术可以精确定位井下人员的位置，地面运控人员根据井下人员身体实时数据，
对所处的的井下区域进行通风、加热或降温等操作，從而节省大量的电力成本；
并帮助井下人员获得更好的工作环境。
该系统还能显示穿戴者的身体状况，帮助快速应对意外死亡或事故处理：
生命特征实时状况及定位，帮助实现快速救援，精确救援。
织物传感材料
Textile 直接织入安全帽内头带

38. Contract Maintenances & Back Up Services
成套设备维护 + 技术支持
Leading Engineering From China

39. The After-Sales Team 售后服务团队

40. 1. HOT provides On-Site Maintenances for the customers of complete supply.
HOT 为成套供货的客户提供驻现场的系统维护服务。
2. Provide remote technical support and other customized technical service for the customers.
并提供生产保障的远程技术支持及其他为客户量身定制的技术服务。
3. HOT expects to provide comprehensive technical services: spare parts consignment+ site technician+
engineer emergency stationed+ remote real-time support.
HOT非常期望提供全面的技术服务：
零备件寄售+现场技术员+工程师应急派驻+远程实时支持
驻现场设备成套维护 On-Site Maintenances